MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
Aug 3 2013, 03:40 PM
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#16
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
Here's a comparison - the map image is from here:
http://www.solarviews.com/cap/mars/phobos6.htm (the image which Tayfun projected onto the shape model originated from USGS as the caption says, but it is the one which I had previously reprojected into modern coordinates. The USGS version was based on an experimental shape model and was badly distorted. I reprojected it cell by cell to fit Damon Simonelli's shape model from Cornell) Hall crater is visible at the bottom. Kepler Dorsum runs horizontally just above it. 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 PDF: 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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Aug 3 2013, 03:48 PM
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#17
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Member Group: Members Posts: 215 Joined: 23-October 12 From: Russia Member No.: 6725 |
-------------------- My blog on Patreon
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Aug 3 2013, 03:51 PM
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#18
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Member Group: Members Posts: 161 Joined: 12-August 12 From: Hillsborough, NJ Member No.: 6546 |
That's an incredible eye you have, Phil. Thank you and sorry. To the untrained eye though, you have to agree that it could be mistaken for the Stickney.
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Aug 3 2013, 03:57 PM
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#19
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Member Group: Members Posts: 215 Joined: 23-October 12 From: Russia Member No.: 6725 |
To the untrained eye though, you have to agree that it could be mistaken for the Stickney. Any big crater on the Phobos is Stickney -------------------- My blog on Patreon
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Aug 3 2013, 04:16 PM
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#20
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Remember that Phobos is synchronously rotating, just like our moon, and Stickey faces more-or-less forward along the orbit, so it's always going to be closer to the limb than to the center of the disk.
A corollary to that is that any spacecraft that either sits on the surface or is in a low, circular mapping orbit (MGS, ODY, MRO) will always only see the Mars-facing hemisphere of Phobos. Only Mars Express and earlier spacecraft have seen other sides. -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Aug 3 2013, 05:08 PM
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#21
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
There's also what appears to be faint "mars-shine" illuminating Phobos if you play with image brightness:
Do we expect the original raw data to be overexposed, because the thumbnails kind of give the impression that the images are well-exposed? EDIT: Ahh, I see now. That one full-res image corresponds to an overexposed thumbnail as well. Other shots should look pretty spectacular, then. -------------------- |
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Aug 3 2013, 05:17 PM
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#22
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Do we expect the original raw data to be overexposed, because the thumbnails kind of give the impression that the images are well-exposed? The full-res image you're looking at is from sequence 1424 and the better-exposed thumbnails from sequence 1423, which presumably have different exposure times. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 5 2013, 09:05 AM
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#23
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Member Group: Members Posts: 238 Joined: 15-January 13 Member No.: 6842 |
Zelenyikot's images of Phobos gave me an idea to overlay colour information from the Mastcam image onto the detailed Celestia image:
For aesthtetic purpose, if anything, but I do hope to hear whether the Mastcam really picked those colours, or whether they're just an artifact. -------------------- Curiosity rover panoramas: http://www.facebook.com/CuriosityRoverPanoramas
My Photosynth panoramas: http://photosynth.net/userprofilepage.aspx...;content=Synths |
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Aug 5 2013, 11:49 AM
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#24
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
I'm sorry to say they are artifacts. There are very subtle colour variations on Phobos but not like those.
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 PDF: 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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Aug 6 2013, 01:44 PM
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#25
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
This is a super-resolution composite of five frames from the Phobos-Deimos sequence on sol 351. Four images (in two pairs) of Deimos appear as smudges on each side - one of them shows the position of the dark limb of Phobos. The 'super-resolution' process (combining multiple views, enlarged and sharpened) is mostly just reducing the JPG artifacts here. Now Stickney can be seen at left, where it was overexposed before.
Phil PS - I don't show it here, but if you increase the saturation in the RGB image you see some color variation - this is real color variation on Phobos, blue around Stickney, red over the northern limb. I say 'real color variation' - not 'true color'! -------------------- ... 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 PDF: 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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Aug 6 2013, 01:52 PM
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#26
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
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Aug 6 2013, 04:10 PM
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#27
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
A few frames registered on Deimos and a few frames registered on Phobos stacked and merged. Magnified 2x, sharpened and white-balanced.
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Aug 6 2013, 09:21 PM
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#28
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
..And a quick animation of the frames so far... very nice indeed, this actually poses an interesting puzzle. So this is perhaps looking at the eastern horizon before solrise with Phobos soon to set. And it looks like Deimos is going retrograde against the background of stars and that must be due to a parallax effect of the MSL observation point sweeping underneath and overtaking Deimos' actual slower motion in the same direction as Phobos..? hoping for a m100 transit if the cam can take it, hopefully in the right place to get one as good as the old Oppy one. Colors come out in the HiRise pics.. |
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Aug 7 2013, 12:10 AM
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#29
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
The moons are so tiny, I've wondered if they'd be much to look at "in person," but based on these images it looks to be a very striking sight.
BTW, the NY Times tracking map now pretty much matches the official. -------------------- |
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Aug 7 2013, 12:46 AM
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#30
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
very nice indeed, this actually poses an interesting puzzle.... hoping for a m100 transit if the cam can take it... Deimos moves E-W and Phobos moves W-E because of the rotation of Mars, so I'm not sure what your retrograde reference is to. If you didn't like the grazing observations last year, there are more chances coming up later in the month. http://meetingorganizer.copernicus.org/EPS...PSC2012-326.pdf -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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