Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 10237
Loc: Oort Cloud
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While observing the Moon last night, I was looking at the northern part of the terminator and noticed a fairly large crater with a mostly shadow-filled floor... except for a narrow wedge of greyish light running across it's midsection. It was a most remarkable sight!
I'd been taking some images a few minutes earlier and unknowingly captured it in the one shown below. The crater is in the extreme upper left corner and the "thin grey wedge" can just be seen.
What crater is it?
Has anybody else here noticed this lighting effect before??
Thanks for your insights! 
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A few telescopes of dubious value.
Understanding wife and three curious cats.
"Semper ubi sub ubi"
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Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 10237
Loc: Oort Cloud
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A bit closer crop...
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A few telescopes of dubious value.
Understanding wife and three curious cats.
"Semper ubi sub ubi"
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Mr Onions
Not Amused
Reged: 04/14/07
Posts: 3454
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Im stumped on that,Clive.
If there was a bridge nearby I would tell you straight away.
It seems? to be in the Meton/Neison region. Hard to tell with these shadows isnt it.
Mr Onions.
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Barchester Onions.
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Mare Nectaris
Pooh-Bah
Reged: 03/09/08
Posts: 1066
Loc: Toijala, Finland
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Hi Clive,
interesting phenomenon! I think it is Barrow.
- I calibrated your photo into Jim Mosher's Lunar Terminator Visualization Tool (assuming the time of shooting 10th July 2008 at 04.00 UT, colongitude being 353.917). Labelled some features there.
Barrow has distinctive formation, as can be seen from this Lunar orbiter pic of Barrow.
Hope this helps - sorry I cannot explain more of this! Anyhow, here's a link to a somewhat similar observation... and a link to LPOD May 13, 2008 with explanations by Chuck Wood and Jim Mosher...
Be well - and thanks for sharing this interesting pic with us!
EDIT: added the LPOD link info
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Share - and you shall have it all
Timo Keski-Petäjä
CtheMoon
Observation shelter KuuMaja (MoonHut)
TAL 250K*Celestron C8-N*SkyWatcher Skymax 150 Pro*TAL1(Mizar)*EQ6 Pro SynScan*Celestron Advanced GT (CG-5 GOTO)*Baader Hyperion Clickstop Zoom 8-24*17 mm UWA-70*TeleVue BIG 2x Barlow*Celestron 2x Barlow Ultima SV Series
Edited by Mare Nectaris (07/10/08 11:13 AM)
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Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 10237
Loc: Oort Cloud
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Thanks very much, Timo!
Yes, it's Barrow crater. 
Those links describe and illustrate the effect very well.
The shaft of grazing illumination across it's floor was most unusual to see. Very cool. 
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A few telescopes of dubious value.
Understanding wife and three curious cats.
"Semper ubi sub ubi"
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Mr Onions
Not Amused
Reged: 04/14/07
Posts: 3454
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Barrow was my 3rd guess 
Was I in the right hemisphere?
Barty.
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Barchester Onions.
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Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 10237
Loc: Oort Cloud
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Yes! 
The northern hemisphere. 
P.s., you're also currently in the northern hemisphere, but not the Moon's.
How's the Tyneside weather today? 
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A few telescopes of dubious value.
Understanding wife and three curious cats.
"Semper ubi sub ubi"
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 3003
Loc: Illinois
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Clive,
A little after the time you were out photographing crater Barrow, I was sketching it. It really was a nice show with the six and half degrees of positive latitude libration. Note that crater Scorsby M a little further north also had a floor sunrise ray.
Frank 
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Stephen65
scholastic sledgehammer
Reged: 04/14/07
Posts: 934
Loc: Melbourne, Australia
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I've seen and imaged these sorts of sunrise rays a few times, they can look quite eerie, almost ghostly.
PS: great sketch Frank
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Megrez 90
FLT 132
Mewlon 250
Lots of XWs, an Ethos, Supermonos and some other EPs
Edited by Stephen65 (07/11/08 04:07 AM)
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kfred
Carpal Tunnel
Reged: 11/11/03
Posts: 2000
Loc: Dayton, Ohio
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I was out last night viewing the moon, and saw it as well.
Fred
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River Cam - Cambridge England
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Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 10237
Loc: Oort Cloud
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Lovely sketch, Frank!
That shows the effect very well.
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A few telescopes of dubious value.
Understanding wife and three curious cats.
"Semper ubi sub ubi"
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 3003
Loc: Illinois
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Stephen, Fred and Clive,
Thank you for the kind words.
Frank
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Mare Nectaris
Pooh-Bah
Reged: 03/09/08
Posts: 1066
Loc: Toijala, Finland
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Frank - that is a beautiful sketch!
Thanks for sharing - be well!
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Share - and you shall have it all
Timo Keski-Petäjä
CtheMoon
Observation shelter KuuMaja (MoonHut)
TAL 250K*Celestron C8-N*SkyWatcher Skymax 150 Pro*TAL1(Mizar)*EQ6 Pro SynScan*Celestron Advanced GT (CG-5 GOTO)*Baader Hyperion Clickstop Zoom 8-24*17 mm UWA-70*TeleVue BIG 2x Barlow*Celestron 2x Barlow Ultima SV Series
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Stephen65
scholastic sledgehammer
Reged: 04/14/07
Posts: 934
Loc: Melbourne, Australia
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Here's a three-fingered ray in Meton D that I caught last year.
(17 October 2007, 1055UT)
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Megrez 90
FLT 132
Mewlon 250
Lots of XWs, an Ethos, Supermonos and some other EPs
Edited by Stephen65 (07/11/08 11:09 PM)
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LivingNDixie
Lord of Ferrets
Reged: 04/23/03
Posts: 15782
Loc: Hoover, AL
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Very neat Clive.
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Preston
Celestron 11" Nexstar GPS XLT
Lunt LS60T/Ha 60mm f/8.33 (on order)
It’s not finishing something when your tank is empty that makes you a stronger person. It’s brushing yourself off and refacing the foe that defeated you with the same determination and willingness to fight that you had when you began your journey.
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 3003
Loc: Illinois
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Timo-- Thank you and you are welcome
Stephen--- Excellent image of the sun rays on Meton D. There is something about the sun rays on a crater floor that is mostly in darkness that really wakes me up.
Frank
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