Sunday, December 07, 2014

 

My Favorite Fuzzies: M31, The Andromeda Nebula


I reckon I am not the only amateur who loves M31, “Andromeda,” as me and my buddies in the legendary Backyard Astronomy Society called it when we were kids. And I am probably not the only amateur who’s had a decades long love-hate relationship with the big galaxy. For Unk it was most assuredly more hate than love in the beginning.

What was it that li’l Unk longed to see more than anything else in the months between his first look at a telescope that seemed attainable, Stephanie’s Telescope, and receiving his 3-inch Tasco reflector? Which pictures did he spend hours mooning over in Stars and in Universe (from the old Science Service), his only two astronomy books? Why galaxies, of course. Gorgeous spirals like M101 and amazing edge-ons like M104.

When Daddy came into li’l Unk’s bedroom early one spring morning in 1965 bearing that Tasco in his arms, I felt like the whole Universe was about to open before me. I was realistic, however. I’d learned enough from the only advanced astronomy book Mama had on her shelves at Kate Shepard Elementary, Patrick Moore and Percy Wilkins’ How to Make and Use a Telescope, that 3-inches might be a little small for looking at most galaxies. That was OK. I’d also learned M31, The Andromeda Nebula (as it was still often called in them days), was close, big, and bright and would be coming round with the autumn stars in just a few months.

Not that I didn’t hunt a few of the spring galaxies before then. To no avail. I didn’t know what a galaxy should look like in my telescope, and especially not how dim even the ones the books called “bright” would be—I thought M51, for example, should look about as bright in my eyepiece as it did in the pictures, just smaller.  It also didn’t help that my scope didn’t have a finder—it had a pair of peep-sights instead—and that I had no idea how to star hop. Even if I'd had an inkling of how to locate objects I couldn't see with my naked eye, I didn't have star charts good enough to help me do so.

I had plenty of fun with the few deep sky objects I could find, mostly bright open clusters. The Tasco’s optics were on the putrid side, and stars and star clusters looked considerably better in her than the Moon and planets. Still, that was just a prelude. As soon as September, I knew, knew, I’d be glorying in the sight of the huge spiral M31.

When school let back in and Andromeda and Pegasus began lifting over the horizon, you can bet I was out there with my telescope. On the weekends, at least. Much as I wanted to get out every clear night, Mama would not hear of it on school nights, even if I’d already done my homework. Observing was not allowed till Friday evening. Not until months and months after I got the scope, when I got the bright idea of getting Daddy interested in looking through the Tasco. That was sheer genius. All Mama would usually do was fume when Daddy announced, “The boy and I are just going to have a quick look at the Moon.” 

Anyhow, on the first clear Friday or Saturday night in late September, I was in the front yard with the Tasco (the house blocked objects low in the east from out back). I suppose it's amazing I managed to find M31 at all—after about half an hour of hunting. Or maybe not so amazing. By this time, I at least had enough sense to use my longest focal length eyepiece (about 30X) for finding.  M31 is huge enough to be hard to miss, anyway, and I now had a subscription to Sky & Telescope and could use its monthly star chart to get me in the general vicinity of the galaxy.

I put my eye to my little .965” eyepiece expecting, as usual, not to see nuthin’ at all, but there was indeed something there. Not much of anything, but something. What there was was a big, round fuzzy ball. I kept staring and I eventually saw the ball was set in a streak of nebulosity that extended well beyond the puny field of my eyepiece—likely a Huygenian with a 30-degree AFOV. At first I wasn’t convinced this was Andromeda, but a moment’s reflection assured me it must be. All the books talked about how bright the galaxy was, and what else even this bright would be here?

Did li’l Rod jump for joy and run into the house hollering that the Old Man just had to come out and look right now? Nope. I was badly disappointed and a little embarrassed for my poor little scope. The pictures of Andromeda in my books, including the shot done by the Mount Wilson folks, didn't make the galaxy look like M51 or M101.  M31, it was clear, didn’t have the out-flung arms of those galaxies, but it still looked better than this mess, this fuzzball set in a saucer of dimmer fuzz.

But…but…everything I read insisted M31 was bright. To li’l old me, that implied my telescope should show detail like in the pictures, just a lot smaller and maybe a little dimmer. Well, then, could my problem be that Andromeda was still too low in the east and in the light dome from nearby Highway 90 with its hordes of neon-adorned motels?

So, I waited a while, till Thanksgiving Vacation—when Mama couldn't complain about me using the telescope on a dadgum weeknight. In late November, the sky was taking on that beautiful, dark appearance fall’s passing cold fronts bring. Orion was peeping over the trees in the east just before Mama hollered me in each night, but the target for this evening was M31.

The result was yet more disappointment. Yes, Andromeda looked a little better. The ball looked brighter and so did the saucer it was sitting in. But that was it. I didn’t see dark lanes or star clouds or nothing else. The problem, I reckoned, was that my Tasco was just too puny, and, like generations of amateur astronomers before and since, I began dreaming of MORE APERTURE and scheming as to how to get it.

Six months later, I did have a bigger scope. It wasn’t much bigger at 4.25-inches, and it sure wasn’t easy to get, but I did get it. Would it help with that cursed M31? I hoped it would, but I had my doubts. Still, I was heartened by what the book, The New Handbook of the Heavens, included in the box with my new (used) Palomar Junior, had to say about the galaxy:
The Great Nebula in Andromeda. This grand spiral is visible to the naked eye as a hazy star, and is the brightest spiral in the sky. A most interesting object:  with low telescopic power, a large, bright elliptical mass; more detail and spiral structure are seen with larger instruments.
Most interesting, huh? Well, that meant it had to be more than just a fuzzball floating on a sea of thin milk, didn’t it?

Just as the Tasco had, the Palomar Junior came to me in the spring of the year, the late spring of 1966, so I had to wait months to see what, if anything, it would do to improve M31. At least I would be able to find it more easily now. The combo of more aperture, a (small) finder scope, Norton's Star Atlas, and me learning to star hop thanks to the help of my buddies in the vaunted BAS, meant I was beginning to knock off the brighter Messiers. I was heartened that every one of ‘em looked better than in the Tasco (those few I’d even seen in the Tasco).

Well hell!” Li’l Unk exclaimed at his first sight of M31 with the 4.25-inch. It sure was a good thing Mama wasn’t in earshot, because the words that came next wouldn’t just have caused her Profanity Meter to twitch, but to redline. The galaxy didn’t look better than it had in the Tasco; if anything, it was worse.

If the central area was brighter, it wasn’t much brighter, and it filled more of the field, with the disk of M31 being less visible with my new 1-inch Kellner (no silly little millimeters in them days) at 48x than it had been with the Tasco’s lowest power, 30x. Was the Pal somehow BROKEN? Nope. A side trip to the (bright) fuzzball of M15, which I’d conquered not long before—with some difficulty—showed the scope seemed to be working well.

The obvious was finally staring me in the face. M31 was big. Real big. What the books said regarding its size, two-and-a-half degrees, was finally sinking in regarding just how huge this thing was in the sky.  Almost five times bigger than the field of my Kellner. While I wasn’t sure, I suspected this large size might be the reason it didn’t look anywhere near as bright as the magnitude I’d seen listed for it in the New Handbook, 4.3, implied it would. That was just a suspicion, and it took a while longer for me to learn “bigger” always equals “dimmer” when it comes to extended objects.

So, that meant a big scope wasn’t appropriate for the thing. But who wanted to fool with small telescopes? And how did big observatories like Mount Wilson get pictures of the whole thing? I didn’t know pea turkey about wide-field cameras or mosaics. I just figgered they slapped a camera on the 100-inch in place of its eyepiece and snapped away, just like I did with my Argus 75. I put it down to THE MYSTERIES OF  PROFESSIONAL ASTRONOMY, and decided I might as well just move on.

Wasn't nothing for it; I had to admit Sam Brown, in the other book that came with the Pal, his How to Use Your Telescope, had nailed it. In contrast to the New Handbook’s “most interesting,” Sam opined that all I would probably see of Messier 31 would be the round glow of the galaxy’s center.

I suppose before we take another step, campers, I really ort-ta stop and do the just-the-facts-ma’m thing. Messier 31, a.k.a. NGC 224, a.k.a. PGC 2557 is a type Sb spiral galaxy. It is nearly edge-on to us, which is what prevents it from making a show with its spiral arms, which are somewhat tightly wrapped, anyway. It is bright, as you’d expect, since it is close, a mere 2.6-million light years away. Even in these light polluted days, it is still visible from half-way decent suburban locations as a fuzzy star about 4-degrees west of magnitude 3.9 Mu Andromedae, the second star from the end of Andromeda’s western chain of suns. If you could smoosh M31 down to a pinpoint, it would look about as bright as Mu.

Down Chiefland Way...
A small, short focal length telescope is a good telescope for M31, but wider field eyepieces can make it better in any telescope. My first dream scope, a Cave f/7 Newtonian I got in the 1970s, was of moderate focal length, but my eyepieces were still of the soda straw apparent field variety. Orthoscopics. Kellners. Even a fugitive Ramsden or two. 

Oh, I had my eye on the More Better Gooder eyepiece-wise, a lovely Edmund Scientific Erfle I’d wanted for a long dang time, but buying the Cave had temporarily exhausted my treasury.  Before I could get a-hold of a wider field eyepiece, I’d grown tired of hauling the long-tubed Cave into the foothills of the Ozarks in my Dodge Dart in the dead of Arkansas winter and sold it, replacing the Newtonian with a C8 Schmidt Cassegrain with 2000 dadgum millimeters of focal length. Unsurprisingly, the C8 wasn’t very good for looking at M31, at least not the galaxy as a whole, not with my eyepiece lineup.

In the years that followed, I would wander over Andromeda way occasionally, for old time’s sake, but didn't pay serious attention to the galaxy again for a long time. Not till the mid 1990s, when the Celestron f/6.3 reducer and ultra-wide-field eyepieces like the Naglers made my C8 into a lean, mean Andromeda machine.

Wider is better for this object. Sometimes. What was brought home to me one night at the Peach State Star Gaze, however, was not so much that, properly equipped, the C8 could take in a lot—though hardly all—of the enormous galaxy, but how much there was to see of Andromeda at all magnifications and field widths.

I didn’t really set out to tour M31 at the 2001 PSSG; it just happened. I was tired after the drive up to Jackson, Georgia and didn't want to spend hours hunting hard stuff. M31 was bright and well-placed for observing. Also, I’d piggybacked my new Celestron Short Tube 80 on the C8, and I figgered that little bird ought to be a natural for the big galaxy.

I gave M31 plenty of time that night and saw one hell of a lot, from its tiny star-like nucleus, to subtle, barely visible details near the nucleus—hints of odd, branching dust lanes—to the immense star cloud NGC 206, to two dark lanes in the disk. This was the best view I’d ever had of the satellite galaxies, which were big and bold. I didn’t stop with them, though.

I hadn’t intended to spend much, if any, time looking at M31, but before I’d left home, I’d had the idea that if I did get around to it, I might try for the ultimate concerning that object. I’d brought along a finder chart that pointed the way to M31’s most prominent globular star clusters. I spotted the brightest of them, G1, with fair ease. It didn’t look like much, just a slightly fuzzy star, but I was gobsmacked to think my humble C8 could show me a globular cluster of another galaxy. The most amazing thing? When I pumped up the power, G1 actually began to look a little like an unresolved glob. It wasn’t much different, really, from the smudge of M15 in my 3-inch Tasco on that long ago night.

While the C8, my Ultima C8, Celeste, showed Andromeda’s details beautifully, the Short Tube refractor delivered the big picture—in spades. In the 80mm f/5, M31 really looked like a galaxy for once. The little scope picked up both dark dust lanes with fair ease, and the big disk just seemed to stretch on forever. If all I’d seen at that star party had been that vision of the great spiral in the little ST-80, the trip would have been worth it.

What is the best view, overall, of the galaxy I’ve ever had? That came one special night at the 2008 Chiefland Star Party with my 12-inch Dobsonian, Old Betsy. How was it? You can read the blog entry, “The 8mm Ethos Faces Dark Skies,” but here’s the relevant quote:

M31 was riding high, so why not? 8mm may sound like a lot of magnification to use on this elephant of a galaxy, but it really is not, not if you want details instead of just the big picture…I saw more of M31 than I’d seen in a long time. Heck, I don’t know I’ve ever had as good a view of this monster with any scope.

Start with the dark lanes. Two were starkly visible. The satellite galaxies, M32 and M110? M32 nearly ruined my night vision. M110 was large—huge—and I seemed to see some sort of fleeting detail near its core. Speaking of galactic nuclei, M31’s core...was not merely “star-like,” it was a tiny blazing pinpoint. I also noticed that something I have had a lot of trouble with over the years, the galaxy’s enormous star cloud, NGC 206, was not merely “suspected” or “visible,” it was bright and easy. 

In the years since, I’ve never quite equaled that observation, though I came close one fairly recent night at the Deep South Regional Star Gaze. While the galaxy was similar in majesty, NGC 206, which I use as a yardstick to how “good” the galaxy is on any given evening, wasn’t as prominent.

DSI M31
How about picture taking? Curiously, I’ve never really gotten a decent shot of Andromeda. Probably because I haven’t done much trying. Oh, I snapped a few frames with my Yashica SLR and my Cave back in the hallowed Day, but the question regarding my results was always, “Is that M31 or a custard pie?” I have had several wide-field refractors in addition to the ST-80 over the years, but only once have I slapped a camera on one and turned it to M31, and that was kinda as an afterthought.

In January of 2009, I had a big expedition to the Chiefland Astronomy Village planned. I was out to kill the deep sky with my NexStar 11 and my Stellacam 2 deep sky video camera. One of Unk’s doctors put the kibosh on that. It seemed I had developed a small and non-threatening skin cancer on my forehead that nevertheless had to be removed, which took place the fraking day before my trip.

Unk was not about to be robbed of his CAV fun, though Miss Dorothy was skeptical. She was reassured when I promised I’d leave the big, heavy 11-inch at home. I’d back off to the C8 and my CG5 German equatorial mount. Almost as an afterthought, I threw my 66mm William Optics SD refractor and my old Meade DSI camera into the Camry and was off.

At the site, I found the surgery had affected my stamina more than I’d expected. It was also some of the coldest weather I have experienced down south in Florida.  So, I spent my nights at the CAV “just” looking at pretty things, both with the C8 and with the refractor, which I’d piggybacked on the SCT, and with testing new hand control firmware.

One element of that updated firmware was Celestron’s spanking new AllStar polar alignment procedure. How would I test its effectiveness? Why not slap the DSI on the refractor and do some unguided 30-second shots of…well…how about M31? The resulting frames were certainly not masterpieces, but they did show that the polar alignment system worked, and they did allow me to claim I’d finally taken a recognizable picture of the galaxy.

I hope to do better soon. In the past, I’ve never been much interested in wide field photography, but that seems to be changing. As soon as M31 is in the west and out of the Possum Swamp light dome again, I may get that old 66mm scope out of mothballs and see how she'll do on M31 with a modern DSLR.

Messier 31, the Andromeda Nebula (I guess I will never stop calling it that), has been a challenge for your old Uncle for near 50 freaking years. I probably won't surpass that look at Andromeda down in Chiefland in '08, but I’ve got a long way to go with it astrophotography wise. Maybe that is a good thing, muchachos; it feels good and right that the book isn't quite closed on Andromeda for me yet.

Next Time: Destination Moon Night 8...

Comments:
Great report. Brought back many memories of using my Edmund Scientific 3" Newtonian back in the early 1960s. More recently I used my 8" LX200-ACF for some M31 DSO observing. NGC206 was easy using 83X. The open cluster C107 was more difficult but visible. The globular cluster G76 was visible at 83X using averted vision and appeared as a non-point fuzzy object at 222X. The globular cluster G1 was easy (once star-hopped to) at 83X and showed a large fuzzy disk at 222X. It was really exciting to be able to view some DSOs in our neighbor galaxy.
 
I know what you mean Rod. I have had friends and family who couldn't wait to see M31 with my CPC1100 with eyepiece or Mallincam. But they are never impressed. FOV is just too small and the nucleus is too bright!
I like your DSI pic of it though!
 
I enjoyed reading about your experiences observing M31, Rod.

Over the years, I've had some great views of the Andromeda Galaxy through a variety of instruments ranging from binoculars to large premium Dobsonians.

One of the most memorable was seeing the galaxy from Cherry Springs State Park in 2005 through a homemade 18.5" (yes, 18.5") Dob equipped with a binoviewer capable of low-power views.

On another occasion at CSSP the warp in the backside of M31 was clearly visible through my friend Tony Donnangelo's 20" Starmaster Sky Tracker Dob.

The best view of M31 that I've had through a small aperture was at Stellafane in 2007 before the 13mm Ethos was released. Al Nagler's 127mm Tele Vue apochromatic refractor and the 13mm Ethos produced an incredible wide-field

view of the largest galaxy in the Local Group.

I've also had fun hunting down quite a few of M31's globular clusters through larger apertures.
 
Hmmm...never tried M31 with a binoviewer...maybe I oughta. ;)
 
A couple of years ago I was trying out a couple of refradtors, a 6 inch achro and a 120mm apo and wanted to compare the view they put up with my 8" SCT. The achro's view was comparable to the SCT, meaning about all I could see from my orange zone drive was the bright nucleus. But when I turned the apo on M31 I gasped. The nucleus was much brighter in the smaller aperture scope and I could see the arms of the galaxy spiraling outward. That view along with superior views of M27 some other things convinced me to keep the apo refractor. Before with the SCT M31 just wasn't anything I was interested in looking at because it wasn't that impressive. But it is very impressive in the refractor as is M42 and so many other objects that I previously thought were mediocre.
 
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