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perfessor
sage
Reged: 12/30/07
Posts: 499
Loc: Northern Illinois
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Doppelmayer, as befits the name, is not a single crater but rather a complex of ancient, overlapping impacts. Situated at the south end of Mare Humorum, it includes arcs of old crater walls that lie partially submerged in the lava plain.
My lunar map is not very detailed, so I don't know where one feature ends and the next one begins - the crater on the left is not identified, so I'm assuming it is part of Doppelmayer. The central peak is surrounded by a curious double ring; I don't think it is really as large as I drew it.
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Tom
"Don't always know what I'm talkin about"
8" f/7
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 4084
Loc: Illinois
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Tom,
Most impressive, I have never noticed the double ring around the central peak but I will have a look for myself at the next opportunity. I made a graphite sketch of these craters in early November of last year but I like your sketch much better.  
Frank 
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my gallery
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perfessor
sage
Reged: 12/30/07
Posts: 499
Loc: Northern Illinois
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Thanks Frank - the rings I noticed may be one of those features that only pop out under certain lighting conditions. I'll take another look tonight, though I'll be sketching elsewhere.
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Tom
"Don't always know what I'm talkin about"
8" f/7
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WadeVC
Carpal Tunnel
Reged: 12/02/05
Posts: 2831
Loc: Lodi, California,
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Very nice sketch perfessor...very nice indeed! 
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Orion XTi10 f/4.7
Orion XTi8 f/5.9
Meade NGC 70mm f/10
Orion UltraView 10x50 Wide-Angle Binoculars
My Sketch Gallery
My Astronomy Blog
A wise man can see more from the bottom of a well than a fool can from a mountain top.
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rodelaet
Post Laureate
Reged: 04/28/06
Posts: 3063
Loc: 50°56' N - 4°58' E (Belgium)
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Tom,
You are doing a great job with these sketches.
Look how your sketches progressed!
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Rony
My Astronomical Sketches
My Binocular Sketches
Callibrate your Monitor with this little strip.
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