Special Ed
Postmaster
Reged: 05/18/03
Posts: 6339
Loc: Greenbrier Co., WV 38N, 80W
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Quote:
Dee, I'm still wondering how you were able to view Rupes Recta was down below to the right on the date and time posted. Could you have the date incorrect? At July 18th, at the 4am UT, with your positioning for Long and lat, Rupes Recta and Clavius would have been exactly where you described it. And have a look at this!!! It matches perfectly!
PURBACH is the crater with the yellow arrow. Lexell has the pink circle around it. The three pink dots at the top right of your sketch is actually Pictet E above Sasserides A. And both of those are to the right of a roundish slope that looks like a big crater, but isn't.
Soooo, could you have accidently put down the wrong date and it was the 18th at 3-4am?
Well, I'm not sure you've nailed it yet--I think you're taking in too much territory. Consider this: In Dee's sketch, in the upper right the two craters one over top the other with the pink dots are Ball (bottom) and Sasserides C (top). The tiny crater that Dee put in between them slightly offset to the east (left) is the identifier.
That puts Lexell to the east of them on the terminator (with the three sided yellow lines). Only the edge of Ball A is rendered (turquoise line). Crater H*ll is to the north on Deslandres with a pink dot in it. The associated craters A and C are also there--one has a dot and the other is circled. I don't know if they are with H*ll or Deslandres. Purbach probably isn't in the sketch.
I haven't looked this up on VMA but Dee might have had the date/time correct. Try that out. 
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Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery
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Erix
Toad Lily
Reged: 12/25/04
Posts: 24022
Loc: Texas, USA
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Ball and the others that you named would have been in complete darkness on the 19th at 03:30UT.  It would have been possible if it were the 18th though.
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Erika
Automatic doors make me feel like a Jedi. 
Zhumell 16", 10" LX200 Classic,Celestron 102 XLT, ETX70-AT, DS Maxscope 60mm, AT6RC
PCW Memorial Observatory
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Special Ed
Postmaster
Reged: 05/18/03
Posts: 6339
Loc: Greenbrier Co., WV 38N, 80W
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It must have been the 18th then. Dee is probably in the Greenwich time zone or just an hour off (maybe with Daylight Savings Time) so she doesn't have the excuse that we have about today being tomorrow Universal Time. 
Here's a screen shot courtesy of the Virtual Moon Atlas that I did a little labeling on. It is 0430 UT on 18 July.
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Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery
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Dee
scholastic sledgehammer
Reged: 03/12/06
Posts: 806
Loc: Ireland
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Erika you have put a lot of time into this puzzle on my behalf and I appreciate yours and everybody else helping out. This evening I printed out your 18th July scenario and accepting that I may have got the date wrong I checked my sketch against your coloured overlay and these are the revelations so far, I can not imagine that it is incorrect as so many elements are in place.
I was lost on the moon; it’s easy to get lost on such a big place.
Dee
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Erix
Toad Lily
Reged: 12/25/04
Posts: 24022
Loc: Texas, USA
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Well it sure looks like it to me, Dee. Michael, yours was certainly a possibility too.
Dee, I think doing detective work for id'ing is fun! And we're all here to help each other out. Something I normally do is make a print out of the moon from the VMA program before I go out. I can then make markings on that printout of what I've observed or what I am sketching to use as a reference once I get back in to write up my report. It really helps.
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Erika
Automatic doors make me feel like a Jedi.
Zhumell 16", 10" LX200 Classic,Celestron 102 XLT, ETX70-AT, DS Maxscope 60mm, AT6RC
PCW Memorial Observatory
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Special Ed
Postmaster
Reged: 05/18/03
Posts: 6339
Loc: Greenbrier Co., WV 38N, 80W
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Quote:
Well it sure looks like it to me, Dee. Michael, yours was certainly a possibility too.
Dee, I think doing detective work for id'ing is fun! And we're all here to help each other out.
Yes, getting out all the maps and charts and solving a puzzle like this is fun (in a lunie sort of way  ). Erika's solution does look good, especially if you're willing to expand your thinking to take in hundreds of kilometers of lunar territory. Erika knows what a wimp I am about sketching anything that huge and complex. I like to pick something simple out in the middle of nowhere ( example ). Sketching lunar features is hard!
Erika, on the other hand, isn't afraid to render the entire Sea of Crises, iirc. 
Regards,
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Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery
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Erix
Toad Lily
Reged: 12/25/04
Posts: 24022
Loc: Texas, USA
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I've tried Mare Crisium once and was unable to finish it. I can't remember if it was the waning stage and the entire area got eaten up with shadaw or if the clouds came in. I spent too much time filling in the shadowed areas so I wouldn't get confused on the where the sunkissed mons areas were. That would have certainly been a good time to try the white on black technique, because then I could have just concentrated on the white areas. 
I have to admit, I normally try to find a crater out in the middle of nowhere too so I won't be so intimidated. But it's fun to try the larger areas once in awhile.
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Erika
Automatic doors make me feel like a Jedi.
Zhumell 16", 10" LX200 Classic,Celestron 102 XLT, ETX70-AT, DS Maxscope 60mm, AT6RC
PCW Memorial Observatory
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kraterkid
Post Laureate
Reged: 03/07/05
Posts: 4709
Loc: Jacumba, California
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Erika, that brings up a a very good point often overlooked when sketching objects on the waning terminator. As the session progresses, shadows can completely obscure the features being represented. This isn't as much of a problem along the waxing terminator where the shadows shorten yet the feature is always in view.
Dee, it takes courage to sketch such an extensive area so close to the waning terminator. This is a remarkable drawing for the amount of wonderfully rendered detail. You've developed a lovely style and I await your next lunar sketch quite eagerly! 
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Rich
My CN Gallery
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