Sunday, October 23, 2016
Issue #514: How Hard are the Messiers from the Backyard (Part II)?
 |
| M110 (lower right) |
M56
You would
think this sometimes-overlooked globular star cluster in Lyra would be easy. It’s
a Messier and it is often riding high in the sky for mid-northern observers.
Not so. It’s loose, and in a 4-inch is usually nothing more than a
dim smudge. It was actually totally invisible in a 4-inch from old Chaos Manor
South downtown. Even in the suburban-country transition zone, it needs a 10 –
12-inch to start looking good, though my 4-inch Explore Scientific AR102 will deliver at least a little resolution there.
M57
No problem. This is the northern sky’s most famous and maybe best planetary nebula. A
3-inch will show its basic shape (although the central hole is not always
easy).
M58
If you are
able to see this Virgo spiral from your backyard, count yourself lucky. I can’t
glimpse it with a 4-inch, and in an 8-inch SCT it is just a dim elongated something that
often requires averted vision.
M59
M59 is a lot
like M58: a small, off-round, dim
galaxy. The saving grace is that it is in the same field as another galaxy, the
more prominent M60, which makes for a pretty view.
 |
| M58 |
M60
This one is
a little more interesting than the previous two, being bright enough to be
doable with direct vision. A 10-inch scope will show some outer haze in addition the
bright, oval core. On a particularly good night a 10 – 12-inch may also show M60’s
companion galaxy, NGC 4647, which is a mere two and a half minutes away.
M61
From the
country, M61 can show spiral structure. From the city? You need an 8-inch to
make it easy to see at all, and what you will see is a round fuzzy that may need averted
vision.
M62
When the summer
sky conditions aren't too hazy, I can make out this Ophiuchus globular without
much difficulty in a 4-inch. An 8-inch on a similar night may resolve a few
stars, but that is not easy.
M63
Canes
Venatici’s Sunflower Galaxy is one of the gems of the Messier list. That said,
in the city don’t expect to see much more than a bright (for a galaxy), large,
elongated glow. The patchy spiral arms? For a good look I need my 10-inch,
Zelda, at the club dark site.
M64
Another
showpiece, the Blackeye Galaxy is easy enough in a 3 – 4-inch telescope. The
dust patch, the black eye? 8 – 10-inches and a darker observing site than my
backyard is needed to make it obvious to me.
M65
One of the
famous triplet of galaxies, the Leo Trio. While it’s not easy to make out these
galaxies’ features from my out-back, I can always tell M65 from M66 (M65 is
more edge-on looking).
M66
Quite a
sight together with M65. As above, it’s easy to tell the two apart (the third
member, NGC 3628, can be difficult to see at all from the backyard, even in the
10-inch, on poor nights).
M67
M67, Cancer’s
“other” open star cluster, is one of my favorites. While not overly bright at
magnitude 6.9, it’s rather compact and easy enough in the 80mm APO refractor.
M68
Hydra’s
seldom visited M68 is really not much of a globular cluster. I often need an 8-inch to see
it from the backyard, and there is not a trace of resolution.
M69
This is one
of the globular clusters located along the base of the Sagittarius teapot. It’s
low much of the time even for me, and is difficult in a 4 or 6-inch telescope. In an 8-inch it
is there, but is still utterly unresolved.
M70
Also at the
teapot’s bottom is M70. It’s more condensed than M69 and looks brighter, but is
still unresolved in an 8-inch (I can see it with the 4-inch). Resolving
a few stars takes the 10, and it usually needs to be under a darker sky.
M71
Sagitta
holds this very loose globular. While it is indeed a globular, it looks more like an open
cluster, and in a 10-inch it resembles M11. In a smaller telescope, a 3 – 4-inch? Visible, but only
as a misty patch in a star-rich field.
M72
Compared to
M2, M72 is most assuredly Aquarius’ “also ran” globular. Quite faint and
unresolved in a 3 – 4-inch and sometimes impossible with small scopes from the
backyard. It’s easier with 8 – 10-inch instruments, but still unresolved in most suburban skies.
M73
This is
nothing more than a little group of four stars (it may actually be a galactic
cluster rather than just an asterism). They are on the dim side, and in a 3-inch can
look nebulous, which is likely why Chuck Messier included them in his list.
 |
| M74 |
M74
The famous
Pisces face-on galaxy, a.k.a. “the Phantom Galaxy.” There is a reason it’s
called that: it is incredibly difficult
from the light polluted suburbs. That said, I spotted it (barely)
with my 8-inch f/5 Newtonian when I was doing the observing for my book The Urban Astronomer’s Guide. “Spot it,”
mind you. Nothing more. On a superior night, it was a dim
round something in a medium power
wide-field eyepiece. Maybe the toughest M of them all.
M75
Somewhat
lost in space in the area between Sagittarius and Capricornus, M75 is usually
doable with a 3 – 4-inch, and on an outstanding night an 8-inch may begin to
resolve it.
M76
The Little Dumbbell
(planetary) Nebula has a reputation for being tough in small scopes. Nonsense. I
could usually pick it up with my old ETX60; especially with an OIII filter on the
eyepiece. A 10-inch begins to reveal some detail beyond the fact that this
peanut shaped cloud, the remains of a dead star, is composed of two lobes.
 |
| M76 |
This face-on
Seyfert galaxy in Cetus is easy thanks to its bright core. On the other hand, a
bright just-larger-than-a-star core and a relatively bright surrounding haze is
all you’ll see whether with a 4-inch or a 12-inch. Looks a lot like a small,
distant, unresolved globular.
M78
A reflection nebula not far from the belt of Orion, M78 gave me fits from my downtown backyard,
even with a 6-inch. Out in the suburbs, it’s easy with a 4-inch scope, being visible
as a strong haze surrounding a double star.
M79
Lepus’
globular star cluster, the only respectable globular star cluster of Winter, really isn’t much.
It’s a small dim spot with my 3-inch APO, and requires a 10-inch or 12-inch to
show a hint of resolution.
M80
This
Scorpius globular is easy to see. It’s small (so small it can resemble a star
at low power) and bright and is not a challenge for my William Optic 3-inch APO, Veronica
Lodge. Resolution is harder, requiring the 10-inch Dobsonian, Zelda, and a lot of
magnification.
M81
Another
Messier showpiece. Bode’s galaxy is frankly, however, only a showpiece for
backyard telescopes because M82 is in the same low power field. While M81 is
always visible from my backyard, it is only visible as an elongated bright
oval. Seeing the gossamer spiral arms takes a dark, dark site and 10-inches of aperture (at least) for me.
M82
M82 is a true
showpiece. The Cigar Galaxy is not just visible in a backyard 4-inch, it shows
off some of the dark detail in its disturbed disk.
M83
The Southern
Pinwheel Galaxy is relatively large and nearly face on, and that usually spells
“tough.” It is always at least detectable, though, as a misty, round patch with
a bright core with the 10-inch. To see it with a 4-inch was a definite
challenge requiring dry, clear skies and the galaxy being near culmination.
M84
M84 was
usually visible in a 4-inch on a good night, but I liked to use a 12-inch Dobsonian, my
now gone Big Bertha, to get a good look at the many other galaxies in the
field. This area is one of the ends of Markarian’s Chain (of galaxies). M84 is
paired with M86 in this field and is the brighter and rounder of the two.
M85
In a 3-inch,
this Coma galaxy can be a toughie, a dim, small, round spot. Much better in an
8-inch, where it shows off a bright, condensed core.
M86
I love M86, which,
together with M84, NGC 4387 and 4388, forms a little 1970s smiley face. As
noted above, M84 is the rounder and brighter of the two Messiers.
M87
Located in the
heart of downtown Virgo, M87 can be detectable in a 3 – 4-inch on a good night
and easy with a 10 – 12-inch. There is not much to be seen of this monster
elliptical galaxy, though; just a bright center and some surrounding haze.
M88
At the other
end of Markarian’s Chain from M84/86 we find M88. It is doable in a 3 – 4-inch
on a superior evening as a round fuzzball, and in an 8-inch begins to show off
elongation.
M89
I’ve seen this
Virgo galaxy with my 4-inch C102 refractor, but it is an easier task for a C8.
In my 10-inch Dobbie, it shows a brighter center.
 |
| M84 and M86 |
M90
Near to M89,
M90 is similar as far as visibility. In an 8-inch SCT or my 5-inch APO refractor it is
clearly elongated.
M91
M91 in Coma
can be seen with a 4-inch using averted vision. Frankly, it’s not much better
in a 10-inch. Even if you have a 20-inch under dark skies, you shouldn’t expect
to see the galaxy’s spiral detail.
M92
While this
Hercules glob can’t hold a candle to M13, it is still great. Easy with my C102, Betty, where it even shows some resolution.
M93
This is a
rich Puppis open cluster, and on a good night a 4-inch will show upwards of 50
stars here with a medium power eyepiece. Looked superb even from my old downtown
site with my Edmund Scientific Palomar Junior 4-inch.
M94
On those
punk nights when the haze is bad and the light pollution at its worst, but you still want to see a galaxy, M94 is where you go. Even in
a 3-inch, it’s visible under remarkably poor conditions as a bloated "star" surrounded by faint haze.
M95
While not as
easy as nearby M105, I was often able to see Leo’s M95 with a 4-inch using averted
vision. Of course, all it was was a dim, round spot.
M96
I couldn’t
see any details in M96 with a 3 – 4-inch, but it was at least easier to make out than its companion galaxy, M95. The C8 would show a little elongation at times.
M97
Even moreso
than M76, this one, the Owl nebula, has a reputation for toughness. Uh-uh. I
could, as with the Li’l Dumbbell, see the Owl with my old and now gone 60mm ETX refractor (with
an OIII filter). The dark patches? The eyes? That takes 10 or 12-inches of glass and a
darker sky than what my backyard usually offers.
M98
This Coma
galaxy was often not easy. Not even with the 8-inch, where it sometimes
required averted vision to show up at all. Obviously strongly elongated in
8-inch and larger scopes.
 |
| M92 |
M99
M99 was
easily as tough as M98. It’s a low surface brightness, near face-on galaxy.
Think “at least 8-inches.” In a C8, it is somewhat elongated on good nights.
M100
Another Coma
galaxy that frequently demanded the 8-inch. Even then, it was most often just a
dim, round smudge.
M101
Let’s go
even tougher. The Catherine Wheel Galaxy in Ursa Major, another face-on, a
large face-on, is nearly as difficult as M74. Nevertheless, I could sometimes
see it with my 8-inch f/5 Newt, and could just about always snag it with my C11 as a
large, faint glow.
M102
Don’t worry
about it. There ain’t no “M102.” It
is most likely a re-observation of M101. If that makes you feel uneasy, look at
NGC 5866, which has sometimes been claimed to be M102. NGC 5866 is doable in a
4-inch and obviously elongated in an 8.
M103
This small,
loose open cluster is visible in my C102, but occasionally melts into the
background star field.
M104
The famous
Sombrero Galaxy. I could make out its equatorial dust lane (maybe with a little averted imagination) with my Palomar
Junior 4-inch Newtonian on the very best nights in the city. The first time you see it,
your reaction will probably be “Darn, smaller than I thought it would be,” so don't be afraid to pump up the power.
M105
Was always
cool in my Short Tube 80 and my Palomar Junior. It’s a bright, round Leo elliptical
that really stands out. The small scopes would also sometimes turn up at least
one of the two nearby NGC companion galaxies.
M106
This Canes
Venatici galaxy is nice in a 4-inch, but do yourself a favor and view it with a
10 or 12 (at least) where it will begin to show spiral detail in addition to a
bright nucleus and a strongly elongated disk.
 |
| M103 |
M107
A seldom-visited
Ophiuchus globular, M107 was routinely visible in my 6-inch home-built
Newtonian 25 years ago. But only as a dim, round fuzzy. A 10-inch instrument is really
mandatory to show a little resolution around its edges.
M108
This galaxy,
near M97, is not overly difficult and not overly easy. It can be seen in a 4-inch on better evenings,
but an 8-inch makes it easier (and e’en then it may need averted vision). In a
10-inch on a transparent night, it will begin to show mottled detail.
M109
Located near
Phad in Ursa Major, M109 is a little easier than M108, but still just a dim
oval in smaller scopes. 10-inch and larger instruments may show some details,
mottling and dark lanes, in the disk on especially good spring nights.
M110
And so we
come to the end with M110, M31’s second most prominent satellite galaxy (after
M32, natch). While it can be extremely easy in binoculars at dark sites, it can be
quite tough with 3 – 4-inch telescopes from the backyard. Relatively large, it’s
just a dim something until you get to
10-inches, where it begins to show elongation and a brighter center. Sometimes it even hints at subtle dark detail.
Whew! And
there they are! Now, get out and see some of them while the good weather lasts.
Down here, I’m pretty sure we are just getting a short reprieve and those
cursed equinoctical gales are sure to be on their way!
Comments:
<< Home
Rod,
Have fun at the Deep South Star Gaze. Right now, it looks like you should have some nice views/images to write about if the weather holds. Up here in NW Pennsylvania, the nasty lake effect cloud season is starting, your prime season begins, ours ends. We had a great summer, may your prime observing season bring the same.
John O'Hara
Oil City, PA
Post a Comment
Have fun at the Deep South Star Gaze. Right now, it looks like you should have some nice views/images to write about if the weather holds. Up here in NW Pennsylvania, the nasty lake effect cloud season is starting, your prime season begins, ours ends. We had a great summer, may your prime observing season bring the same.
John O'Hara
Oil City, PA
# posted by 
: 2:54 PM
: 2:54 PM << Home
