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azure1961p
professor emeritus
Reged: 01/17/09
Posts: 731
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My last deepsky view thru my 8" was of M100 - I could see the tantelizing motteling at times like details were just beyond grasp.
Anyone see arms or structure here in an 8" besides the gentle rise in brightness to the nucleus? I feel like a better site would give me a dustlane perhaps.
Pete
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walt r
Post Laureate
Reged: 02/13/07
Posts: 3463
Loc: Doylestown, PA
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I believe if your sky is dark enough and you are well dark adapted then yes, you would be able to see structure in M100 with an 8" scope.
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Walt
Obsession 18" f/4.45 #1370 AN/SC
MK67 Deluxe 6" f/12 Mak-Cass, Super Polaris GEM, JMI MicroMax DSC
DIY 60mm f/6 Achromat
Cookbook 245 CCD
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 8289
Loc: Beatrice, Nebraska
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Quote:
My last deepsky view thru my 8" was of M100 - I could see the tantelizing motteling at times like details were just beyond grasp.
Anyone see arms or structure here in an 8" besides the gentle rise in brightness to the nucleus? I feel like a better site would give me a dustlane perhaps.
Pete
What I generally saw in my old 8 inch f/7 was a roughly circular hazy spot with a small brighter core region and some mottling in the outer haze. At times using moderate power (100x), I could catch glimpses of the arc-like segments of the arms, but overall, it didn't come out as an overall spiral form quite as well as M51 does. Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
Prairie Astronomy Club
http://www.prairieastronomyclub.org
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Achernar
Postmaster
Reged: 02/25/06
Posts: 5028
Loc: Mobile, Alabama, USA
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This galaxy never showed much detail to me except the steady brightening towards the nucleus and patchiness in it's oval disk. I can't say for sure if I've seen spiral arms or not, but I have yet to look at it under a very dark sky. Seen it many times from the light polluted skies outside of my city, and it's bright enough to look good even in a 6-inch from a less than perfect site.
Taras
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15-inch F/4.5 Dob under construction
10-inch F/4.5 Discovery Dob
6-inch F/8 Homebuilt Dob
4 1/4-inch F/4 Homebuilt reflector
A whole bunch of eyepieces, filters and other accessories....
Two curious cats
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BillFerris
Carpal Tunnel
Reged: 07/17/04
Posts: 2910
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In my old 10 inch, M100 showed a central bar with spiral arms unwinding from the core. My notes and sketch indicate the spiral structue was fairly obvious so, from a dark and transparent site, I would expect some indication of spiral structure to be visible.
Bill in Flag
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Grand Canyon Adventure
Lowering the Threshold
18" Obsession
4.5" Meade 4500
10x50 Swift Audubon
Cosmic Voyage
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Carol L
Reged: 07/05/04
Posts: 6034
Loc: Tomahawk, WI 45N//89W
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The best i've ever done (8"SCT) is avertedly detecting a bit of momentary mottling away from the center. The steady brightening towards the nucleus which Taras mentioned is always there.
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 Authoring the monthly AstroSketch page in "Sky at Night" magazine
Lunar Sketch Tutorial
CN Gallery
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azure1961p
professor emeritus
Reged: 01/17/09
Posts: 731
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Thanks everyone!!! The skys werent pristine nor was the elevation anything to write home about, but that was the spot through the trees that I had!! I like this one though.
Definately worht returns. Up in northwestern CT there are some surprisingly good dark sky areas. Ill try again then.
Pete
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