SLIM, Small Japanese lunar lander |
SLIM, Small Japanese lunar lander |
May 3 2024, 05:04 AM
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#121
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Solar System Cartographer Group: Members Posts: 10162 Joined: 5-April 05 From: Canada Member No.: 227 |
A bit more on that curious little bright spot adjacent to the SLIM lander:
https://twitter.com/this_is_tckb/status/1785878807557099996 This link goes to a tweet from the same person who posted the SLIM image, but it refers to an OHRC image of Chandrayaan 3. It also shows a small bright spot right next to the Vikram lander. The poster, Chandra, suggests it is Pragyan but it is in the wrong place. ISRO's map and a second map show Pragyan about 33 m northwest of the lander, and I have shown that it is visible at that location casting a shadow in an LRO image. And that same object is casting a long shadow in this new image too so the bright spot certainly is not Pragyan. So, two OHRC images both showing a very bright lander at low sun and a small bright spot right next to it. I think it is an artifact, perhaps caused by an internal reflection in the camera and showing up because the real image of the lander is so bright. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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May 4 2024, 03:09 PM
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#122
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Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
An internal reflection should tend to appear along a radial line passing through the bright source and the optical axis (centre of frame). Considering the full frame, is that the case here?
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May 6 2024, 06:04 AM
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#123
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Solar System Cartographer Group: Members Posts: 10162 Joined: 5-April 05 From: Canada Member No.: 227 |
I don't know where this is in the full frame.
On the SLIM website: https://www.isas.jaxa.jp/home/slim/SLIM/gallery/index.html a caption to this OHRC image notes: "It is unclear what the light spot in the immediate vicinity of SLIM is, but it appears to be about LEV-1 in size." I had considered that, but I was puzzled by the appearance of a small bright spot adjacent to two different landers in images taken by the same camera. I looked for a common cause but I was probably wrong to do so. The LEV-2 image of the lander doesn't show anything at that location but the position of LEV-2 is not known yet, so LEV-1 might be hiding behind the lander. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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