Sunday, August 30, 2015
“The Friendly Stars”
I’ve been thinking for a while that it would be fun to
revisit the City Lights/Urban Astronomer objects and see how they look to me today. There are admittedly a few more miles on the old eyeballs, which now
deliver more than a trace of astigmatism, but I have much more observing experience, considerably more even than when I rewrote the City Lights essays into a book shortly after the turn of the century. Certainly, my telescopes are better than the humble
homemade 6-inch Dobsonian I used on that 1993 summer's night. And my skies today are
considerably better than they were downtown where I did much of the book's observing.
Not worlds better, though, but that
is the point of City Lights astronomy: “What can I see from my backyard?”
In addition to wanting to revisit my urban objects, I had
another agenda. I am looking forward to a busy star party season this fall with me attending
several, at least, regional events. I plan to drive to every one of ‘em—Deep
South, Peach State, Maybe Chiefland, too—and I will naturally take a telescope
with me (unlike when I fly to remote star parties for speaking engagements). Which telescope? Whether I go visual or video, I’ve decided that will be
my C11 and CGEM mount. That being the case, I needed to check the rig out, since
the last time I’d used it had been, almost unbelievably, last February during a
somewhat abortive Chiefland expedition.
What happened to my old friend Bertha, the NexStar 11 GPS? I got tired of her late last year. I’d
used and loved the telescope for over a decade, so I was more surprised than
anybody when I suddenly became dissatisfied with her. Perhaps, in retrospect,
that was my first hint I’d be going through lots of changes in the coming months
(I still am). All I knew at the time, though, was that I was sick of lifting my
11-inch fork-mount SCT in and out of my vehicle. Was I done with the C11?
The Celestron C11 has always been the queen of SCTs
for me. More practical than a C14, but with a big aperture advantage over a C8.
And there has also always been a certain something about the C11, a certain je ne sais quoi that has nothing to do
with the telescope’s optics. In addition, I was loath to sell a C11 with a carbon fiber
tube. It’s beautiful and it reduces temperature induced focus shift, and they
don’t make them like that anymore. Finally, my C11 was one of the last made by Celestron as an American company when it was owned by Tasco (Tasco, contrary to popular belief, was an
American company), and somehow that further endeared Bertha to me. OK, OK, I’d
keep her, but I’d have to fix her.
How the heck would I do that? Simple: G-E-M. I’d put Bertha
on a German equatorial mount, which would, I hoped, kill two of those metaphorical
birds with one stone. Dispensing with the heavy fork would make the telescope
easier to transport and being on an equatorial mount would improve my
tracking. Yes, I had a wedge and could have run Bertha in EQ mode, but the
difficulty of mounting that big scope on a wedge made it something I never did.
It was a two-person operation, and even with a helper was not something I cared
to do often. Or at all.
Which GEM? That might have been my Atlas. The draw there was I had the mount already and wouldn’t have to spend for a new one. The down-check
was that while I have gotten a lot of use out of the Atlas for prime focus
imaging, I’ve never been happy with its computer. The goto accuracy is fine for
imaging three or four relatively bright targets in an evening, but not for imaging
100 a night with the Mallincam. And even when you're doing only a target or two a night with a wide field telescope, sometimes (but not all the time) pointing can be pretty punk. There are fixes for that involving computer software like EQMOD and plate solving applications, but many's the time I don't want to drag a PC into the field.
I’d also have had to change out the mount’s saddle for
something sturdier; I’d have had to convert from Vixen dovetail compatibility
to the wider Losmandy D system to provide as much steadiness as possible for
the C11. That would mean all the other scopes (four of ‘em) I use on the Atlas
would have to go “D” as well. The more I thought about it, the less the Atlas
sounded like the answer.
My next candidate was a Losmandy G11 Gemini II mount. The
G11 is a beautiful piece of kit, several steps above the Chinese imports. It would be
expensive at over three thousand dollars, but if it meant I’d be able to
continue using Bertha, I was willing to bite the bullet. Or I was till I set up
next to a new Gemini II G11 at the 2014 Deep South
Regional Star Gaze. The mount was beautiful and finely made, but it was
obvious to me that the Gemini II goto system, which Losmandy gets from a third
party, was still a work in progress. Didn’t seem too user friendly, and the
dude who owned it had a lot of trouble getting it going at all.
I had little doubt Losmandy would soon get the bugs out, but
the more I thought about it, the less I was convinced I needed to spend
even the relatively small amount of money a G11 commands for my modest
requirements.
I thunk and I thunk and I thunk and I came up with two
potential candidates, the first being the new Synta (SkyWatcher, Orion) AZ
EQ-6. It is the modernized Atlas EQ-6 and is somewhat lighter and prettier than
the original and features an alt-azimuth mode and a dual format Vixen/Losmandy
D saddle. Nice looking mount, but I eliminated it for two reasons. First, I
doubted I’d use the alt-az mode much, since I was sick of that for video with
the NexStar 11 GPS. Also, I’d heard from owners that the mount’s goto accuracy
with the hand control was more like that of the Atlas than it was different.
Which left me with one mount choice. One that in retrospect
seemed perfect. I was amazed, frankly, I hadn’t thought of it first, the Celestron CGEM. The CGEM had a
somewhat bumpy introduction, true, but Celestron has worked hard to apply both
software and firmware fixes to get the mount up to snuff, I believed they’d
accomplished that, and I believed the mount would be perfect for my uses. I
didn’t depend on hearsay or what the Good Buddies wrote about the mount on
Cloudy Nights, either; a buddy of mine owned a CGEM and I observed it and
observed with it.
What is the mount like? The CGEM, which is another update, Celestron’s
update, of the venerable EQ-6, is much like the older Synta mount.
However, it is different in a very important way. In addition to various design
tweaks to make the CGEM more modern-looking and ergonomic, the SynScan
controller and stepper motors have been replaced by Celestron’s NexStar HC and servos. That
NexStar HC ensures the CGEM’s goto accuracy is outstanding. Easily as good
as/better than my NexStar GPS, which never missed a target that I can recall.
Finally, like the modern EQ-6es, the CGEM features a Losmandy D type
saddle.
You can read all about the coming of the CGEM and my
deforking of Bertha here, but to make that proverbial long
story short, I ordered a mount from Bob Black at Skies Unlimited, and ordered
a D type dovetail for the C11 from B&H Photo. Everything arrived when it
was supposed to, went together in an afternoon, and came with no
surprises. I used the mount two or three times in the backyard, and that one
time in Chiefland. But after that terrible spring and summer weather had closed me down till now.
Confession time. But for the fact I wanted to give Bertha a clean bill
of health for the coming star party season, I’d likely have used Zelda, my 10-inch Chinese dobbie, for the
night’s observing instead. If you are going visual, frankly there is no reason
to lug out a big, honking C11 and CGEM. The images Zelda provides are indistinguishable from those of a C11. Sure,
tracking is nice, but as you-all know, I am addicted to 100-degree AFOV
eyepieces, so I am not nudging the scope along all the time. Goto is also nice,
but in the backyard I ain't chasing minute PGC galaxies and I do just fine
with a finder and a star chart. Still, there is no denying the C11/CGEM
experience is a very pleasant one--once you have it set up.
“The Friendly Stars”
Back when I did the observing for what would become the
Friendly Stars chapter in Urban Astronomer, I didn’t have a C11. I didn’t even
have a C8 at the time. I was observing with a freaking 6-inch Sonotube
Dobsonian I cobbled together in my garage. So, I expected great things of the
night’s objects in my big CAT despite the presence of a just-past-First Quarter
Moon. The seeing was not great thanks to a front passage, but it was an uncommonly comfortable
night. The temperature was plunging, on
its way to a record low for us for August, mid-sixties. Certainly, nicer than
the sticky night recounted in my book.
 |
| M10 |
As above, this night wouldn’t just be about observing; it would be
about tuning up the telescope. I’d already accomplished my first task,
adjusting Bertha’s focuser. One of the screws on the focuser backplate had
loosened over the years, making focus action stiffer than I liked. Ten minutes of
tweaking indoors and it was good to go again. What else other than mount
checkout? I couldn’t remember the last time I’d collimated the scope, so I
thought I should at least check it.
Goto aligned and polar aligned (via the AllStar routine in
the hand control), I sent the scope to a bright, but not too bright, star, centered it precisely, and threw it slightly out of focus with a
counterclockwise twitch of the focus control. Just enough to show me the
star’s diffraction rings. Yep. Squished on one side.
The rings were, in other words, not concentric. I needed to
collimate by adjusting the secondary mirror. I fetched a Phillips head
screwdriver from the shop and started twitching screws by small amounts. There
are ways to figure out which screw you need to turn given the look of the
diffraction rings, but I’ve done this so much that I am comfortable just
picking one, turning it (tightening), and seeing if it is the one that needs to
be adjusted.
In the end, I loosened one screw by a small amount and that
was enough. Yes, I preach that it’s bad to collimate by loosening screws, but
if a screw is as snug as it goes, it is OK to loosen its opposite number(s) to
keep moving in the proper direction. In fact, you have to. Anyhow, I re-centered
the star and gave it a critical check with a 5mm eyepiece. Looked like a little
bullseye when the seeing cooperated. I was done.
Next? Over to M13. It wasn’t officially a member of the
night’s list, but I went to it anyway for two reasons. First, again, one half my agenda was checking scope/mount, and I wanted to be sure the gotos were
up to snuff. The cluster was nearly at zenith, and the area straight overhead
is often a problem for mount goto systems. Not for the CGEM. M13 was almost perfectly
centered in a 15mm ocular. Later in the evening I did some further goto testing. At f/6.3
with the reducer corrector screwed onto the rear cell, the CGEM got anything I
requested into the field of a 5mm eyepiece at 353X. Yes, it was a 100-degree
AFOV ocular, but that is still darned good in my book.
The other reason I punched up M13? As I say in the book, how
can you fail to visit Herc anytime he is over the horizon? The cluster, despite
the Moon and despite my usual ration of light pollution, was a wonder, a
sprawling thing, almost a spider shape composed of tiny stars. It looked best,
I thought, in a 10mm eyepiece, which yielded just shy of 180x, which was enough
to darken the background sky considerably. I spent a long time staring at the
Great Globular, but not too long. As
I also observe in The Urban Astronomer’s Guide, dessert only does not a
nutritious meal make.
 |
| M12 |
Time to prowl the reaches of the serpent bearer, Ophiuchus,
just as I did on that decades ago night. Where to start? With his best of the
best, M10, one of the so-called Twin Globs. Unlike that 1993 night, when I had
to do considerable squinting and nudging the scope around to arrive at the subdued stars of Ophiuchus in the
summer haze, I just mashed “M-0-1-0” into the hand control, Bertha’s CGEM made its
noises (which are at least a little
less grating than the CG5’s weasels-with-tuberculosis sounds), and we were
there.
What did I say about it back in the day with my little
6-incher (probably equipped with a 25mm Kellner)? I thought M10 was beautiful. When I switched to my prized
6mm Orthoscopic, I could make out plenty
of stars around the cluster’s periphery. Heck, I even thought I spied a few
near the core with averted vision.
This night? No, my eyes are not as good as they were back
then, but 5 additional inches of aperture makes up for a lot of deficiencies. In the 10mm 100-degree ocular, M10 was far more beautiful than it
had been in the 6-inch. There were still the stars around the cluster’s edges,
just many more of them, and looking at the glob’s center revealed still
more. And more and more. With direct vision. M10 is a Shapley – Sawyer Class VII
globular. It’s loose enough to allow you to easily resolve stars across its
face, but tight enough so that it really “looks like a glob.” Wonderful. Get
out and look at it tonight, folks.
M12 is the other twin. But it is only a twin in the sense that it’s
nearby, about three and a quarter degrees from M10. It looks nothing at all like
the previous object. M12 is much looser, a class IX. It’s not so loose than it
fades away into the background like the really loose NGC 5053, but it was loose
enough to be somewhat of a pain in the six: “I was disappointed...it’s not nearly as good from this suburban site as
I’d hoped. It is a vague, ghostly glow 3 or 4’ in size at most in my scope.” I
did note a little central condensation, signs of the cluster’s core, but that
was not easy. Worse, I couldn’t resolve a single star anywhere in the cluster,
even with a magnification of 250x.
Again, the 11-inch made plenty of difference. It still
wasn’t like looking at a photo taken from a dark site, but it was very
obviously a globular star cluster showing a goodly number of stars both at its
edges and, thanks to its looseness, in the core area. In the C11 the central
region was easily distinguishable with direct vision. It wasn’t as good as M10
by a long shot, but still good.
 |
| M62 |
Onward. Next up was Messier 5, which on an above average night can
impress me more than M13. This was the only object of the evening where the 6-inch
came close to equaling the C11. And that was only because Serpens’ big-glob was
in the trees and being partially blocked. Frankly, the view was still better in
the C11, where I could make out stars near the core, but nevertheless the
impression was much the same as it was with my old cardboard dobbie: “Lovely with a compact core. 200x reveals
plenty of outlying stars but not many in the center.” The cluster is strongly
elongated, something I picked up on with my small scope and which was
obvious in Bertha.
The next Friendly Stars DSO, M107, wasn’t just skirting
treetops, it was completely blocked, so I bypassed it and continued on to
another Ophiuchus globular star cluster, M62, which was in an open area. This
is a rather tight Class IV glob, which makes it nice and bright and easy to
pick out even for observers at more northern latitudes. While M62 is bright
looking and actually bright in fact at magnitude 6.5 and 15’ across, it’s
dimmer and smaller than the previous globs, and I had to use high
magnification, averted vision, and a dark cloth over my head to keep out stray
light in order to resolve a few stars with the sixer.
Once again and not surprisingly, the C11 made a difference,
if not a huge one. Yes, a dozen or so stars were visible with direct vision,
but they were not overly easy, and the impression was mostly “grainy-looking”
rather than “resolved.”
If you’re going to tour Ophiuchus, you have to be in the
mood for globular star clusters, since they are his most prominent objects.
They are not his only objects,
however. There is also a pretty little fuzzy of a planetary nebula, NGC 6572,
a.k.a. “The Blue Racquetball Nebula.” It lurks not far from the stars 67 and 70 Ophiuchi
and is not hard to track down even without goto.
The problem comes when you get there. Can you distinguish
the Racquetball from a field star? The object is bright at 9th
magnitude, but also small at 11” across. In the 6-inch I had a hard time
telling it from a star even with the 6mm Ortho. In fact, what keyed me in that
I had found it was the object’s striking blue color, which made it stand out
immediately.
 |
| The Blue Racquetball... |
In the C11, it was easier to pump up the power to over 300x
and resolve the planetary as a little fuzzy racquetball (I think tennis ball is
actually more apt). The funny thing, though? Barely a trace of the planetary’s blue
color did I see. I thought maybe, barely, I could detect a very subdued
blue-gray, but that was almost impossible. What was the problem? Worse
seeing than that 1990s night? Too much glass in my 9-element eyepiece? Older
eyes? Who knows? I’ll have to come back to this one before the season is out. I
long to see that face-slapping color again.
And that was it. Oh, I didn’t intend for that to be it. There were a few more objects in my list,
and I wanted to backtrack to M107 when it was out of the tree leaves, but that
was not to be. As sometimes happens, the leading edge of the front had some
clouds behind it and they closed me down for all practical purposes. The Moon
was higher now, too, definitely interfering badly. I threw the big switch.
One especially important thing I remember from the end of
that long ago Friendly Stars night? That when I finished observing I felt a lot
less lonely than I was when I began:
"Lonely? By the end of the night, I
didn’t feel a bit lonely. After soaking in so much beauty, the night and the
Universe didn’t seem mysterious or forbidding. Even the distant, enigmatic
globular clusters seemed no stranger than friendly bees buzzing around the hive
of the Milky Way’s center."
2018 Update
What has changed in the three years since this one was posted? There has been a sea change in my practice of amateur astronomy thanks to the back injury I sustained not long before this was written. I thought it had all healed up, but in the months following this entry waves of back pain let me know I was wrong. Thanks to that, big telescopes and big mounts are no longer an option for me. I tried to keep on with the C11 and CGEM, but it was a no-go. Bertha, CGEM, and Atlas were all sold.
That really wasn't a bad thing, though. I never did much long-exposure imaging with the C11--and long exposure DSLR imaging is my focus in astrophotography now. As I noted above, for simple visual observing from the backyard, it's not much fun setting up a C11 and a big German mount. When I go deep sky cruising in these latter days, it is with my 10-inch f/5 GSO Dobsonian Zelda, who is in some ways actually preferable to the C11. When I want to take pictures, it is with with an Edge C8 or 5-inch APO on a Celestron AVX or Losmandy GM811, both of which mounts are far more pleasant to use than the CGEM or Atlas.
Anyhow, as I tried to communicate in the post above, it's not really the equipment you put into amateur astronomy that makes the difference. It is the heart. Many things have changed in my outlook on life over the last three years, but one hasn't. That long-ago August run with an humble 6-inch Sonotube reflector is still one of the most memorable astronomy nights of my life.
Sunday, August 23, 2015
AHSP 2015
I knew there would be a 2015 edition of one of my
favorite—maybe my absolute favorite in some ways—star party, the Almost Heaven Star Party held at Spruce Knob
Mountain in West Virginia. Yes, I knew there’d be an AHSP 2015; I was to be one of their
speakers, and I had my airline tickets. But part of me just didn’t see how
there could be one.
The reason was that a guiding light, perhaps the guiding light behind the star party,
Phil Wheery, was taken from us some months ago. If you didn’t know Phil, I’m
sorry you missed him. In addition to being an outstanding amateur astronomer
and a great organizer, he was just a great guy. Over the course of my life,
I’ve met few people as kind and generous as Phil. Without him, I wondered if AHSP
could ever be the same.
Well, I was going to find out. Early on Friday
morning—seriously early—I set out for Mobile Regional Airport to catch the 6
a.m. redeye for DC. In order for me to get to the airport in time to catch a
ride with the AHSP person who was going to take me up the mountain, I had to do the early one. Oh, I probably could have made it to Dulles in time to catch my ride in easier fashion by
driving to Pensacola for the non-stop to Washington, but that came
at a price: the Bayway.
In order to get to Florida, you have to cross Mobile Bay, and you do that via a stretch of I-10 that runs over a long two-lane (each way)
bridge across the Bay. There’s a tunnel,
too. In the summer, and particularly on Fridays and Sundays, traffic can be
backed up for miles and miles with tourists going to and coming from the
Alabama and Florida beaches. Not fun. Even if the traffic were clear on the
return leg, I’d have to drive at least 45-minutes to get home from Pensacola,
and when you are tired out from star partying that isn’t much to look forward
to.
So, the 6 a.m. flight out of Mobile it was.
Outbound wasn’t that bad. I don’t expect U.S. Airways, America’s version of the
notorious Soviet airline, Aeroflot, to be anything but terrible. Their gate
personnel are among the most confused and unfriendly I have ever encountered. I
know that, so I was not disappointed. I’ll admit I am still scratching my
head, however, at the fact that a well-before-noon flight wouldn’t have
freaking coffee available onboard. Oh, well; it is what it is.
 |
| Deck outside the Main Yurt... |
I expected the first leg of my journey, Mobile to Charlotte,
to run late. It always does with U.S. Air. I was a bit worried about my connection,
and I was correct to be, as I arrived at the gate for the Charlotte – Dulles
flight just before the doors were supposed
to close. For once I was lucky. I went up to the podium and inquired as to whether
boarding was over, and learned it hadn’t even begun. This one was running late too. I
learned that, by the way, not from the Gate Agent, who just stared at me and
said nothing, but from a fellow traveler.
Anyhow, in about another hour and a half I was landing in
Washington, retrieving my suitcase, and meeting up with ace observer and AHSP
staffer Donna Blosser. Donna is not just a very nice woman; she is a committed
and talented deep sky observer, so naturally we had a lot to talk about on the
way up. The journey seemed a lot shorter than the three and a half hours or
so it consumed, and almost before I knew it, we were turning off for the drive up to the
Mountain Institute (TMI) Spruce Knob site. We stopped at the Registration Tent
where I got my packet and my T-shirt, and was directed to meet up with AHSP’s
Kathryn Scott, who would get me settled in my room.
The last several years, I’ve been in the dorms, but this
time I was back in a small yurt. Yep, you heard right, “yurt.”
The trope used for all the TMI facilities was buildings in roughly the shape of
Mongolian yurts. They are not tents, but they do look like something you’d find
on the steppes of Asia. My yurt, the same one I’d stayed in the year a
tremendous thunderstorm threatened to sweep the observing fields clean of
scopes and tents, had been repaired and rehabilitated and was comfortable
enough.
Next step once I was unpacked to the extent I was going to
unpack, was to walk down to the Main Yurt to see what was going on. One thing that was
going on was that NOVAC, the Northern Virginia Astronomy Club, AHSP’s parent,
more or less, organization, had set the facility up with Internet access. I was
warned it was kinda slow, but I found it to be quite good. When you don’t have
a telescope onsite to tinker with in the daytime, the hours before dark can be
long ones, so I was happy to be able to surf the ‘Net.
Another nice surprise was seeing my old friend and former Editor at Sky
& Telescope, Bob Naeye. Like me, Bob has been speaking at AHSP since
forever, almost since the event began, and he wasn’t going to let a little
thing like his retirement from the magazine stop him from continuing to do so.
Retirement had obviously agreed with Bob who, like me, retired early and good
on him.
 |
| My usual travelling companion... |
Supper was next. And you know what? This year, more than any
year before, I was happy with the food. Maybe because I have turned the page on
my diet (amongst other things) and was down with the vegetarian and other
health-conscious food choices the TMI people always offer at least as alternatives. Some of the (good) sweet and sour chicken and a salad and I was a
happy camper. Literally.
After the meal, it was time for the first major talk of the
event, which was Bob holding forth on the Hubble Space Telescope’s achievements
over its now surprisingly long lifetime. It’s a story I know well, and because
of that and because of my weariness from the trip, I was afraid I was going to nod
off during Mr. Naeye’s presentation, but, you know what? That darned Bob did
such a good job that he kept me awake. Kudos.
After Bob wrapped up, I strolled onto the deck of the Main
Yurt to have a look at the monitor out there, which was displaying satellite
imagery and the Clear Sky Clock (err… “Charts”). It didn’t look absolutely
horrible, but it didn’t look good either. Lots of light blue squares in the
transparency row for Friday evening. So what? I, like everybody else, headed
for the spacious observing fields anyway.
There, I spent a little time with AHSP honcho and NOVAC Vice
President Chris Lee and his charming wife, Erin. As we chatted, that TMI magic
began to happen. The clouds started to disperse with the setting of the Sun
and we were soon looking at a burning Milky Way. There may be slightly darker
spots east of the Mississippi than TMI, but I haven’t visited them. If deep sky
observing and imaging is your goal, I don’t think you can do better than AHSP
unless you travel to a western desert.
Not that I did much observing. Oh, I looked through a scope
or two, but mostly any views I had were through the extremely modest instrument
I’d brought along, a 6x30 Celestron monocular (which did a surprisingly good
job on the summer Milky Way and M22) while I was firmly ensconced in a lawn
chair setup outside the RV of NOVAC President Terry Cabell and his wife, the
incomparable Pat. What I mostly did was sit and talk and drink the wine Pat had
laid out (the Northstar Merlot was a
big surprise and a treat).
One of the best things about AHSP is the kindness and
friendliness of the people I encounter there. If I mentioned everybody who was
nice to me this year, I wouldn’t have space for anything else. However, I do
want to give a shout-out to just a few of the many people who went out of their
way to see I was happy and taken care of. In addition to Terry and Pat and
Chris and Erin, there was star party dynamo Elizabeth Erickson, whose good
humor and enthusiasm never fail to cheer me up. There was the
aforementioned Kathryn Scott who made sure my trips up and back down the
mountain were as easy as possible. Finally, Donna Blosser had, I'm sure, rearranged her schedule just to fetch me from the airport. I could keep going, but you get the
picture.
The only person missing was Phil. Or was he? If he wasn’t
quite there with us on the field, it was as if he were at least looking down on
us from the Great Beyond. This year’s star party set a record with three
beautiful nights. Coincidence? I think not. I believe ol’ Phil was watching out
for us from his spot Out There, which no doubt has far darker and even more
star-spangled heavens.
In my hoodie, wearing a ballcap, I was comfortable out on
the field for quite a while, but inevitably, the cold—it was in the 50s in August
if you can believe that—began to seep into me and it was time to say goodnight and hike back to my yurt. Which I did, falling into a sleep that didn’t end
till after 8 a.m. the next morning.
Yep, the days can be long at a star party when you don’t
have any astro-gear or much else to mess with. Luckily, there were more good
presentations in the afternoon, including Elizabeth Warner’s fantastic
talk/demo on capturing asteroid occultations with video cameras. So inspiring
was her talk that it made me want to get involved in occultation chasing.
Naturally, I also had my own talk to prepare for, so while
the afternoon dragged a little bit, it wasn’t too bad and was punctuated by
more good food including excellent burgers (sans buns for me, natch) for
supper.
 |
| A little scary, if pretty... |
You can bet I had a look at the heavily laden tables of the
event’s sole vendor, Hands-on Optics. There was plenty of good stuff there, but
nothing I just had to have, so I kept
my credit card in my wallet. Oh, I could have bought something, but my current
mindset is against buying more astro-junk. Much better would be actually using what I already have, which is
way too much anyway.
Then it was time to go on. My talk this year was “Observing
the Old Fashioned Way,” which concerned my at least temporary desertion of
computers and cameras and electronics for time honored visual looking with my
simple Dobsonian, Zelda. I wanted this talk to be fun. As I told Terry on the
field the previous evening when our discussion turned to star parties and
conventions and amateur astronomy in general, the most important thing we can
do for ourselves and our fellow amateurs and new recruits is to show and tell
how much fun amateur astronomy is
in addition to all its other good points.
I think I accomplished that. I had plenty of slides and I
believe I conveyed some good information for both newbies and those who’ve been
away from eyepieces for a while, but I also believe I did it in a manner that was
light, even for me. I flipped through my slides at a good pace, and was done in
what was a hurry for me, just under an hour with questions.
Then it was time to worry. At sundown, the sky was looking
awfully putrid. Almost scary at times. Clouds were just boiling out of the
west-northwest. I suspected the scent of skunk was in the air. So much so that
I told Chris I thought I should move my SCT collimation workshop from the
field to the Yurt.
Surprise. Almost unbelievably, the clouds began to drift
away just as it got dark. Oh, there were lightning flashes to the north and to
the south, but they were always way north and way south and never got close.
Saturday was another charmed night, and was at least as good as Friday had
been.
Me? At 9 p.m. I trotted back down to the Main Yurt. I could
have done my workshop on the field, but I didn’t want to confuse things by
changing the location again. In the end, I believe that was a good decision.
Being able to explain the supposedly black art of SCT collimation in a lighted
room with slides and diagrams showing how to adjust a scope was probably more
beneficial for most of my audience than trying to show them how to do it on a
dark field would have been. Next time, I do hope to do a hands on, but I was
satisfied with the workshop, anyway.
 |
| Doing my thing (photo courtesy E. Erickson)... |
Then it was back to the field for good times with old
friends and good times with new friends. I never really got chilled Saturday
night. It was damp enough, but maybe not quite as damp as Friday had been. The
cold didn’t seem to seep into my bones as quickly as it does on a more humid
night. I was also much more rested. I hung in till about twelve before saying
night-night.
Since my flight would not be till early evening Sunday, for
once I didn’t have to rush around in the morning. A leisurely start to the day with a welcome
breakfast, a little email reading, and visiting with my fellow AHSPers made for
a more relaxed departure day. I talked to Erin Lee, who'd kindly volunteered to
deliver me back a Dulles, and we decided it might be good idea to hit the
road at 11:45 a.m., since the air transport system had had big (computer)
problems Saturday, and we feared it would be badly snarled Sunday, too.
It was a pleasant drive back to DC with Erin and her son,
Patrick, an outstanding young amateur astronomer, and I was in a good mood.
Till we got to Dulles, that is. The traffic jam out front looked like what
you’d normally see just after/before a big holiday. Good thing we were several hours
early. I said my goodbyes and began the process of trying to get through
security. I finally made it through the crazy long lines, and plunked myself
down at the gate. I had a couple of books, and Dulles has good options for
dinner, so all-in-all the wait was not onerous.
The pain didn’t come till Charlotte. The time for the
departure of the Mobile flight, 9:40 pm, came and went. I asked about it at the
podium, and after the particularly unfriendly
and clueless U.S. Airways drone stared at me for a while, marveling
at my NERVE at asking, I was told we’d board “in a few minutes.”
Hah. It was to be over an hour before they let us on the
aircraft. Why? They finally fessed up. One of the crew, a particularly
irritating cabin attendant, had lost her luggage and they were hunting all over
the airport for it. I wondered how long they’d have held the flight if I’d lost
my bag. In the end, I put it down not so much to arrogance on the part of the U.S.
Airways folks as to the fact that most of them, and especially the gate
personnel, almost to a man and woman, just don’t seem to know what they are
doing.
I made it home just after one a.m., and thanked my lucky
stars I don't have to drive all the way downtown anymore. That wasn’t all I
thanked my lucky stars for. Those lucky stars had shone over one of the best
Almost Heavens I have attended. It shouldn’t have been that way, realistically,
but NOVAC stepped up to the plate and hit a homerun. I’ve also got to say,
“Thank you for looking out for us this year, Phil.” Other than that? “See everybody
up on the mountain next year!”
Sunday, August 16, 2015
Where's the Blog?
Sunday, August 09, 2015
Get Ready...
Yeah, I know, sitting under stagnant and hazy or cloudy and
stormy skies as August comes in, it’s difficult to believe the fall star party
season will soon be here, but it will be. It actually gets under way for me in mid
August with the famous Almost Heaven Star Party
in West Virginia. From then on for me it’s one after another till November
begins to wane, often as a speaker, but sometimes just as an attendee seeking
relief from the months of deep sky deprivation we’ve typically been through thanks
to a stormy summer.
I won’t be taking a telescope to AHSP, but I will be hauling
a load of gear to the other ones I do this fall: the Deep South Regional Star Gaze, the Peach State Star Gaze, and the Chiefland Star
Party. Maybe even one or two more. I don’t just plan to do a bunch of star
parties this fall, either; I plan to do ‘em right after a near-all-summer
layoff. I’ll be packing Big Bertha, My C11, and her CGEM mount—or at least Mrs.
Emma Peel, the Edge 800, and her VX GEM. Mallincams. DSLRs. Computers. Monitors.
The whole nine yards.
Seeing as how we’re barely two months out from PSSG, I
thought I ought to slowly, ever so slowly, begin checking out the gear that has
sat unused for most of the last six months. So, on a particularly rainy
Wednesday afternoon last week I began the process of getting the star party
stuff sorted. Maybe you should do the same…
Telescopes
You might not have to do anything to the telescope. If you’ve got an SCT or a refractor or another semi-sealed tube scope that’s
done nothing but sit, you probably won’t have to do much more than give the
corrector or objective a quick eyeball to make sure it doesn’t need attention. Don't mess with it unless it needs it; as
you know I am very much against cleaning optics unless they are really dirty.
However, if yours is an open tube scope, a Newtonian for example, it might be time to clean. I don’t clean the mirrors of my Newts every year,
though; I don’t have to. “But Rod, but Rod, I shined a 10,000 candlepower
flashlight down the tube and saw some dust!” Leave that dust alone, Skeezix.
It’s not hurting you. Optics will almost always have a little dust on them, and
it will not affect images. Yes, modern mirrors are over-coated and their
surfaces are not as prone to damage as they used to be, but you still run the
risk of doing more harm than good by cleaning. Pollen, fingerprints, bird poop?
Yes, clean. A little dust? No.
If you simply must clean, go the traditional route. Rinse in the sink. Wash with tap water with a
few drops of Dawn dishwashing detergent added. Scrub problem areas with wetted
lens tissue or white Kleenex applying little or no pressure. Rinse with distilled water.
Correctors and objectives? I use a Lenspen for small areas. For larger areas I
employ the time tested combination of original blue Windex, original white (no
lotion of course) Kleenex, and canned air.
Otherwise? Check out your OTA (optical tube assembly)
fittings. I like to mix and match different finders with my scopes, so I always
triple check that the finder in the case with the scope is the correct one for
the finder mount shoe currently installed on the tube. If you have an
illuminated finder, now is the time to replace those cursed little button cell batteries.
Give the focuser a few twitches to make sure it’s in tune. Maybe polish up the
scope’s tube with a little Pledge if you want to impress your buddies, and you
are done.
Mounts
This used to be easy. “Does it still move when I undo the
locks?” “Does it track in R.A. when I plug the plug into a wall socket?” That
was it. Today, it is far more complicated since you are likely using a
computerized goto mount or at least digital setting circles. At the minimum,
I’d set the mount and scope up in the house and do a fake alignment and few
fake gotos to make sure the scope points in approximately the correct
directions given the time you entered in the hand control. Check all cables and
connections and clean with zero residue electronics cleaner as required.
Doing a fake goto alignment in the house or seeing if your
digital setting circles seem to “track” OK when you move the scope is a minimum. Personally, I would not think of taking an
electronically assisted telescope, especially one that hasn’t been used in a
while, to a star party without a complete check-out in the backyard.
If your mount, like most of Celestron’s newer ones, features
a real time (battery backed) clock, make sure it is still keeping time. If you
have not set the time in months, it will no doubt be a few minutes off, but
shouldn’t be more than that. If it is, replace the battery. Go ahead and change
the battery in your digital setting circles computer whether it still seems OK
or not. 9-volt batteries are cheap and it’s easier to replace one at home in
the daytime than in the middle of the night on a dark star party field.
Finally, get your power squared away. If you will be using
batteries, make sure they are in good shape. The best way to do that is by keeping them in good shape. Lead-acid
batteries (including jump start battery packs) should be charged for 12-hours
after each use. If they have not been used over the course of a month, charge
them for 12-hours anyway. If you are smart, you will test your batteries with
a battery tester before the event. Jump start packs have built in ones, but one
for your golf-cart or deep cycle battery is only a few dollars. Checking the
voltage of a battery not under load with a multi-meter will tell you little. A
battery tester is better and is convenient to use.
Eyepieces
Check ‘em out.
Make sure the ones you’ll want to use at the event are in your case. In the
course of observing from the backyard, my oculars tend to get distributed
around the house. Cleaning? Sure, if they’ve got gunk on ‘em, clean ‘em.
Eyepieces are like camera lenses; they are tough compared to first-surface
mirrors and will stand up well to repeated wrong-headed cleaning. I use nothing
but a Lenspen on eyepieces.
Might be a good time to fill in the gaps in your eyepiece
collection. If you, like me, are addicted to 100-degree apparent fields of
view, this is a particularly nice time. Several vendors—Explore Scientific,
SkyWatcher, Meade, Lunt, and William Optics—have introduced lines of ultra-wide
100s in the 200 dollar range. About what I paid for my Zhumell Happy Hand
Grenade 16mm 100-degree a few years ago. And guess what? All are very much
better in every way that the good, old HHG.
Computers
Do the usual things…make sure all the software you’ll want
to use is installed and operational. That’s particularly important right now,
since many of you will have just updated to Windows 10. Now, Win 10 is much
more like Win 8 and Win 7 that it is different, so theoretically there
shouldn’t be any compatibility problems. What ran on 7 or 8 should run on 10.
But, like I always say, “Trust but verify,” which is one of the few things Ronnie
R. ever said that I (sort of) agreed with. It might not be a bad idea to test
your really critical programs, like auto-guiding software, in the backyard or
at the club site.
Make sure you’ve got your computer power sussed, too. If you
are going to be at a site without AC, you’ll need batteries. Unless you are
running a little netbook, it is unlikely your laptop’s internal battery will
last more than a couple of hours. How much battery you need depends, of course,
on your computer’s power consumption.
Even if your site has AC power, you might consider taking
along a battery for the computer (and scope, too). I’ve been to more than one
event where every single power outlet on the field was taken up by the time I
arrived, and I had no choice but to run on batteries.
How do you actually run a laptop on a battery? There are DC
to DC solutions, but most convenient for me is a simple inverter. DC to AC
inverters put out power more than good enough to keep the laptop’s internal
battery charged. Choose one with enough current capability to suit your machine
(taking into account any devices like cameras that will be powered from the USB
port of the computer). Harbor freight is a good source of inverters. A 17ah
jump start battery will power my laptop for an entire run, and I found an
inverter at HF that plugs right into the jump starter’s cigarette lighter
socket.
Cameras
If you will be taking pictures, check the camera
thoroughly. Shoot some pictures if possible. Even just terrestrial ones with a DSLR or a quick grab of the Moon with a CCD. Ensure all the cables you need are present and in good shape—please
triple check this. Adapters to attach your camera to your telescope should be
in the camera case, not on a shelf somewheres. Other imaging items like guide
scopes or off axis guiders should be in the camera case or telescope case, too.
If you run a DSLR, make sure the camera battery is in good shape, that you have
an extra on hand and that all are charged. If you want to be extra safe, you’ll
invest in a 12volt or AC adapter for your DSLR.
If you use a cooled CCD camera and your camera features a desiccant
pack that keeps the interior of the camera dry and frost free, make sure the desiccant
is ready to go, that it is dried out. With most cameras that involves baking the
desiccant plug in an oven at low temperature for several hours. A few cameras
allow/require you to replace the desiccant. Do whatever you need to do; a
frosted-up chip makes a CCD camera utterly useless.
Camping gear
If you camp on the field like I occasionally do—when there
is no other alternative, usually—inventory your stuff: tents, sleeping bags,
cots, camp tables, and ancillary items like camp stoves, fans, and heaters
(ones that are safe for use in tents).
This is the time to replace or add to your camping stuff as
required, in late summer while the outdoor stores still have plenty of camp-out
stuff on the shelves. Is your tent in good shape? Large enough, and, most
importantly, tall enough, to make it bearable for a few days? A small tent you
cannot stand up in when you are changing clothes, is a recipe for, yes, an
unhappy camper.
Pay attention to your sleeping bag. Is the one you have
appropriate for the temperatures you’ll face? What will you put the bag on?
Some people can live with air mattresses or even foam pads. Not moi. I like to put my bag on a cot,
which is a much more comfortable arrangement for me. Not only is a cot more
comfortable, being off the cold, cold ground, even with a good bag, keep you
warmer.
Finally, if you are using a Coleman stove or a catalytic
heater, make sure these things are in good working order and that you have
enough gas bottles to last your entire stay (always buy at least several more
than you think you will need; propane is cheap). If you are planning on cooking
your meals onsite (not me), begin gathering up the pots and pans and implements
you use when doing camp food.
Assorted Stuff
You’ll likely need extension cords. Round up yours and make
sure they are longer than you think you will need. If you are in the least
doubtful, get to Wal-Mart and buy an inexpensive but reasonably heavy duty
outdoor cord. While there, pick up plenty of batteries in sizes appropriate for
everything you have that needs batteries.
One other thing you might as well take care of is warm
weather clothing. If you’ve been at amateur astronomy for a while, you know
that you will never be colder than you are when you are out under a clear sky
standing stock still or nearly so for hours looking through a telescope. If you
don’t have enough warm clothing (layer yourself), get to the store and get what
you need when they start putting out the winter things (won’t be long).
Along the same lines, visit an outdoor merchant—Academy,
Bass Pro, etc.—ASAP and get a season’s supply of those little chemical hand
warmer packs. They are useful to keep not just you warm, but also things like
telescope hand controls. Unfortunately, the stores, down here anyway, tend to
sell out quickly since hunters snap them up as hunting season nears. “Early
bird catches the worm” and all that rot.
And that does it for now. Squirrel your new purchases away
somewhere where you’ll be able to find everything easily in a month or two when
it is time to PARTY. When we get a little closer to that time, we will take up
the next step: getting all that stuff in your vehicle.
Sunday, August 02, 2015
The (Sub) Urban Astronomer Night 1
If you’ve been with me for a while, you know I spent over
twenty years under an urban sky in downtown Mobile, Alabama’s Garden (historic)
District. Despite light pollution that at its worst could extinguish stars much
dimmer than magnitude 3.5, I still wanted to observe from home—occasional trips to the club dark site and star parties weren’t nearly
enough. So, shortly after I moved in at Chaos Manor South in 1994, I began to survey the deep sky from my bright backyard.
At first, seeing much of anything other than open clusters under those conditions
seemed a hopeless task. When you can only make out the three brightest stars in Ursa
Minor, how can you hope to observe distant galaxies? But I persevered and eventually
had surprising success. Not only did I conquer the entire Messier (even M101
and M74) from my backyard and similarly bad urban sites, I saw many objects
from the NGC and more obscure catalogs.
What I saw of deep sky objects from the backyard of the legendary Chaos Manor
South didn’t usually match what the objects would have looked like from good
skies, but I had a ball anyway. I had so much fun I wanted to share my
experience and my urban observing techniques. Which I eventually did in a book,
The Urban Astronomer’s Guide. The Guide isn’t perfect, but I am still pretty happy
with it today. Probably happier than I am with anything I’ve ever done. I still
consult my own book at times, and that ought to tell you something.
If you’ve been hanging out here long, you also know that a
little over a year ago I moved from downtown to the far western suburbs. Not
only did I gain a mostly tree-free backyard, I went from magnitude 3.5 to a
zenith limiting magnitude of 5.0 on clear winter’s nights.
While a 1.5 magnitude gain doesn’t sound like a huge difference to newbies, old
hands know that it increases the number of visible stars tremendously, and that
the sky background in the eyepiece is much darker.
I had the occasion to pick up Urban Astronomer the other day
after not looking at the book for a while, and after I got the information from it I
was seeking, I got to thinking. My skies are better now, but they are still not
perfect. Wouldn’t it be fun to go back through the The Urban Astronomer's Guide's list of
DSOs and see how much, if any, better they looked from the new manse? I’d been seeking
a visual project I could execute from my new backyard. Sounded like this might
be it.
Going back through the urban objects would also give me a
chance to share the tips and techniques I developed and/or employed for dealing
with bright skies when you’re chasing dim objects. Over the years of working on Urban Astronomer—it began as a series of columns in my club newsletter in 1993
and didn’t become a book till over a decade later—I did a lot of thinking about
and experimenting with what I called "city lights observing techniques," and developed some
pretty strong opinions on everything from light pollution reduction filters to
telescopes to star atlases.
Let’s start this first installment of the new project with a few preliminary tips. None
of these is earth shattering; most are just common sense, but when you’re
battling light pollution, whether from a red,orange, or yellow zone, forewarned is forearmed.
The size of your telescope, its aperture, is important. There’s
an old urban legend (that’s appropriate) going around that says large aperture
telescopes are useless for urban observing. That a big mirror gathers more
sky glow than a smaller one and actually shows less of the deep sky. Nonsense.
Short and sweet? Set up a 12-inch and a 6-inch reflector
side by side. You can even make the 12
an f/5 and the 6 an f/8. Point ‘em both at Hercules' M13. In the 6, the Great Globular is
just a bright blob. In the 12, even under poor conditions, it is a ball of
tiny, tiny stars. If the sky background is too bright in the 12-inch, just pump
up the power a little to spread out the background glow . All things being
equal, more aperture always wins, and may be even more valuable in the suburbs than
in the country.
Gain as much dark adaptation as you can. Even a little is better than
none. There’s nothing you can do about light pollution—other than work to decrease it over the long run—but there is
something you can do about ambient light, which is what mostly prevents you
from gaining a modicum of dark adaptation, from allowing your eyes to become as
sensitive to dim light as they can get. Begin by turning off your porch and other intruding
lights, of course. If the people next door have lights on, shield yourself from
them—it’s usually impossible to get people to turn off their yard lights, even
for a little while, on a regular basis.
What I used to do was build stage flats. Frames of 1x4 lumber covered with muslin and painted
black. Made stands for ‘em out of more 1 x 4s, and they could then be positioned as
needed to shield me. Keeping ambient light out of my eyes and my telescope made
a huge difference. This is so important that it wouldn’t be silly to consider
building an actual observatory in your backyard. Really, one is even more
helpful under bright sky conditions than under country ones. I would suggest a
dome-type solution, since a dome will do more to block ambient light.
Baffle your telescope. I don't mean you should confuse the poor thing. More than a few Newtonians, especially
imported Newtonians, are designed so that ambient light can enter the tube
through the mirror end. A simple baffle like the one I cut out of paper in
5-minutes for my old Edmund Scientific Palomar Junior will definitely improve contrast.
Look for any places where ambient light can enter your
optical system. If the telescope’s tube in front of the secondary mirror isn’t
long enough, light is probably hitting that secondary and ruining contrast. Use
plastic or paper or anything similar to extend the tube. This has the added
benefit of helping keep dew off the secondary mirror.
Don’t be afraid of high power. In general terms, most amateur
astronomers use too little rather than too much magnification under all sky conditions.
Probably because when we were novices we were warned off “300x” by the
veterans. For very good reason: our
imported 60mm refractors wouldn’t handle it. But your 8 or 10-inch telescope of
today certainly will.
While it will make extended objects like galaxies and
nebulae dimmer, higher magnification also spreads out the background sky glow and darkens the eyepiece field background,
often making the target easier to see. Stars will not be spread out, so higher
power will definitely increase contrast of star clusters.
Let me reiterate, keep ambient light out of your telescope and out of
your eyes. Even if you’ve rigged up a light shield, it’s wise to go a
step farther. Drape a black cloth over your head and your eyepiece. This will
keep all the ambient light out, and that is particularly important when using
light pollution reduction filters. If you allow light to enter the eye-lens of
your eyepiece, the performance of any LPR filter, whether UHC, OIII, whatever, will be
very adversely affected.
I often hear newbies say they are disappointed with
their light pollution filters. That they don’t make as much difference in the backyard as they’d
hoped. Part of the reason is the above. Filters, which screw onto the field lens end
of an eyepiece, the telescope end, work by reflecting unwanted light away from the eyepiece. If you let ambient light enter the eyepiece
from the eye lens end, it will be bounced right back into your eye from the
“wrong” surface of the filter, the surface facing your eye, ruining any
contrast gain you would otherwise have achieved.
Use light pollution filters, but understand their limitations.
OIIIs, UHCs, H-betas, they all have their places in the backyard and can make
the difference between seeing and not seeing dim nebulae. They can also
reveal more details in the brighter objects, but be aware they are not a
panacea. They do not work on everything.
Unfortunately, as many newbs are disappointed to hear, an
LPR filter won’t do squat for a galaxy or a star cluster. Those objects are
made of stars, and, unfortunately, the light of stars falls in the same range
of wavelengths as the earthly light the filters are designed to reject. Some
people will tell you a mild filter like the Lumicon Deep Sky will
improve a galaxy by darkening the background sky without dimming the target
object too much, but I’ve never noticed much improvement visually (mild filters
can help with galaxies during imaging).
Wait for it…wait for it. Can’t snag M101? Wait for the best
time. Wait for culmination, the time
when the object you are chasing is as high as it ever gets, when it crosses the
local Meridian, the imaginary line that divides the sky into east and west
halves. Won’t do that over the course of the current evening? Come back when it will for a better shot. Even if an object is not very high when it
crosses the Meridian, it is still as high then as it will ever get, and you will be
looking through less air.
Also wait for those special nights, nights that are especially dry
and clean, like evenings after a winter cold front has passed through and
cleansed and dried the sky. Dust and humidity amplify light pollution,
scattering any sky glow that is present and making things worse.
Finally, wait for an object to be positioned in the best
part of your sky. If you’ve got a Wal-Mart to the east, wait till your prey
begins to sink into the west. It’s sometimes the case that an area lower down
in the sky might actually be better than the area closer to the Local Meridian.
Use a red light. It might seem obvious, but some newbies don’t grok
that even in light pollution you want to use a red-filtered flashlight rather
than a white one. Remember, you are trying to attain as much dark adaptation as
possible.
How about those red-tinted "Astro-goggles" Orion has sold for years? I tried 'em; sounded like a good idea. Not
only would they protect my eyes from ambient light sources, I could put them on
and run into the house if I needed to without blowing out my dark adaptation. Alas, not such a
hot product. I didn’t mind that
wearing them made me look like the king of the nerds, but they fogged up
instantly even in the winter, and I was constantly tripping over stuff and
bouncing off walls.
Use digital setting
circles or a goto scope for object finding. While I am currently going through a
non-computer “simplify” phase, there is no denying goto and DSCs are a godsend
for the urban or suburban observer. If you can’t see many stars, it may be
nearly impossible to find objects in star poor areas using a zero power finder
like a Telrad. Even a 50mm finder may leave you lost in space.
You’ll be amazed what you can see of objects in the urban/suburban sky if only
you can find them. For example, the first night I had my NexStar 11 GPS, I
couldn’t resist giving her first light in the backyard of Chaos Manor South.
Unfortunately, it was one of the haziest spring evenings in a while. Couple
that with the light pollution of my red zone, and I didn’t expect to see
galaxies. I keyed in M64, anyway, and when the goto stopped, I inserted my 12mm
Nagler and had a look. At 233x, there it was, the good, old Black Eye galaxy.
Not just visible, but showing off the dark spot, the black eye, almost as well
as from the club site.
Use the same visual observing tricks you use from a dark site.
Look away from a dim object instead of straight at it to bring your eye’s dim
light receptors into play. Use averted vision, that is. Still can’t see your
quarry? Jiggle the scope. The eye has an easier time seeing dim moving objects.
Use all your standard tricks.
Most of all, don’t give up. Keep persevering and you will
almost always be rewarded. No, you probably won’t ever see the Horsehead Nebula
from your back 40, but it is more than likely you will eventually conquer M74
and the other hard Messiers. And many other besides. It took two seasons of
trying before I picked up M101 from Chaos Manor South with my 8-inch f/5 Newt,
but pick it up I finally did...
And so it was that on one recent evening that I again found myself
out under a light polluted suburban sky with a telescope. Yes, the skies of the
new manse are usually better, considerably better, than they were at Chaos
Manor South, but not on this night. In addition to heavy haze and
intermittent clouds—this has been such a lousy summer—there was a fat gibbous
Moon hanging in the sky.
Seeing what the bright sky could offer up wasn’t my
motivation for braving the bugs, anyway. My mission was to begin testing a set
of eyepieces I am evaluating for a magazine article. That was exactly what I focused on
for a couple of hours: serious business.
Once my work, which had been easy enough to accomplish in the horrible
conditions—all I needed for ocular testing was the Moon, Saturn, and some
bright stars—was done, I thought I’d have some fun. See what I could pick out
of the mess.
Well, heck. How about M13? OK, but where was it? The
telescope I was using this evening, as it has been on many recent evenings, was
my low-tech GSO 10-inch Dobsonian, Zelda.
She doesn’t have goto. She doesn’t even have DSCs; just a 50mm finder and a
zero power sight. The problem was that the sky was now poor enough that I
couldn’t make out a single star in the whole constellation of Hercules. The night
had gone from “bad” to the proverbial “worse.”
“OK, then. No M13 or M92. What else?” I looked around. I
could see the Dipper, but the idea of trying to find the Owl Nebula or M108,
much less M101, on a night such as this seemed patently ridiculous. Out of all the “rules”
I listed above, however, the one I’ve taken the most seriously is “Don’t Give Up.” If
you want to be an urban or suburban astronomer, you have to banish “surrender”
from your vocabulary. You will not go inside without seeing something. Well, I could see Vega shining bravely. If I couldn’t see
the ring, I’d at least see the Double-Double.
Nudged the scope one last smidge while looking through the finder
(scope), and then put my eye to the 15mm 100-degree AFOV eyepiece. “OK, where are you, you little sucka?”
One thing I remembered from my urban astro salad days was that you can’t always
depend on even the brightest objects to jump out at you. Always examine the
field carefully. I did that and there was M57, a somewhat ghostly smoke ring.
Was it better in my 10-inch than it had been in my 4-inch Palomar Junior (which I
often used in the early days of my urban observing)? Yes. Was it that much
better? Not really. Frankly, it looked a lot like it does in this rather crude
drawing from decades ago.
Conditions were so poor by now that even Zelda’s ten inches of aperture didn’t help much. When I added a UHC filter—I wanted to be sure
the eyepieces I was testing were smoothly threaded for filters—the view improved
a little. I could see that the center of the ring was filled with haze more
easily than I ever could with my Pal, and I could pick up a few of the dimmer
stars scattered across the field, but, no, it wasn’t that much better.
Which didn’t matter a bit. As I had been on so many city-bound
nights, I was just bowled over to be able to see anything and surprised at how good a deep sky object could look
under such atrocious conditions. I looked, and I looked, and I looked. Until a
batch of real clouds shut us down. Had I seen as much as I would have on a
clear, moon free night? Or from a dark site? No, not hardly. Had I had fun
anyway? You betcha, and that is what matters most to me these days.
