Has Odyssey Imaged Phobos? |
Has Odyssey Imaged Phobos? |
Aug 16 2005, 02:13 AM
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#1
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Senior Member Group: Members Posts: 1278 Joined: 25-November 04 Member No.: 114 |
I can't seam to find any images done on Phobos by Odyssey?
Was there any planned? |
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Aug 16 2005, 03:06 AM
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#2
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Member Group: Members Posts: 345 Joined: 2-May 05 Member No.: 372 |
I don't think so.
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Aug 16 2005, 03:14 AM
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#3
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
I asked the Odyssey people if they were going to do any Phobos imaging during aerobraking. They said no. But I would like to know if MRO will do any. They might be interesting. However, Deimos is the moon we really need better images of right now. We have great coverage for Phobos from Viking, MGS and Mars Express (yes, and Meriner 9 at low res). But Deimos is in comparison very poorly imaged, with one whole side seen only in two high sun images.
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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Guest_BruceMoomaw_* |
Aug 16 2005, 04:35 AM
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#4
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Guests |
It will be very interesting to see what Mars Express and MRO can provide for Phobos not only in the way of near-IR minerology, but (in Mars Express' case) radar sounding.
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Aug 16 2005, 06:57 AM
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#5
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
QUOTE (Phil Stooke @ Aug 15 2005, 10:14 PM) ... We have great coverage for Phobos from Viking, MGS and Mars Express (yes, and Mariner 9 at low res). ... Don't forget the Russian Phobos mission. While it did die just before beginning its intensive Phobos encounter, it did get a suite of some pretty high-quality images of Phobos as it approached. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Aug 16 2005, 08:07 AM
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#6
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Founder Group: Chairman Posts: 14448 Joined: 8-February 04 Member No.: 1 |
The MRO chaps said specifically no science during aerobraking at a press conf (and also no UHF between MRO and MER even as a checkout )
Doug |
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Aug 16 2005, 11:52 AM
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#7
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
Deimos just plains looks *STRANGE*, too. It's all rounded, with a very active regolith creaping downhill away from topographic highs making bright streaks and burying craters. All the asteroids we've looked at, including Ida's tiny moon Dactyl (very few things so far Deimos' size) don't remotely look like Deimos.
We have very limited info on their surface composition. Black.. minimal or zero well defined spectral features in not very good data from Earth and Phobos 2 and the like. And I don't trust the analysis of what little we have. "Space Weathering" clearly modifies asteroid spectral features, much as it does lunar regolith specta. Mature regolith has a much less structured and interpretable spectrum compared with fresh rayed crater ejecta and the like. Phobos and Deimos are both inside Mars' gravity well. Ejecta from them may have escape velocity from their local gravity, but not readily from Mars gravity. A much larger fraction of their ejecta (for their size) is probably recaptured than for comparable size asteroids... the resulting surface material may be a very mature regolith indeed. One negative result is that there is no so-far detectable water-of-hydration in Phobos spectra, unlike low-temperature carbonaceous chondrite specta. That's been used to rule out a C2 or C2 composition in captured-body scenarios, but in a fully mature regolity, that spectal feature may be totally obliterated. I'd really like to get sample return from both of them. Enough sample from Phobos might contain Deimos, as well as Martian ejecta. If Deimos's weirdness is due to composition difference, not some mechanical property difference or orbital-environment difference, we'd likely be able to spot Deimos grains in Phobos dirt as "non-phobos, non-mars" |
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Aug 16 2005, 12:08 PM
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#8
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Senior Member Group: Members Posts: 1278 Joined: 25-November 04 Member No.: 114 |
QUOTE The MRO chaps said specifically no science during aerobraking at a press conf (and also no UHF between MRO and MER even as a checkout ) Whoa, that's sad. |
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Aug 16 2005, 06:32 PM
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#9
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
I'm very embarrassed to have forgotten to mention Phobos 2. Yes, it did give some very useful images. In particular it greatly increased the low phase coverage available for Phobos, allowing albedo and/or photometric variations to be mapped over much larger areas than Viking alone provided... plus spectral variations. I really hope Phobos-Grunt is successful. At least they have finally managed to get funding for it after years of trying.
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 16 2005, 06:53 PM
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#10
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
MRO will take pictures on Phobos (big and closer) and Deimos (small and farther)during its approach to Mars.
"To help future missions in the Mars Exploration Program, Mars Reconnaissance Orbiter will carry an optical navigation camera. From 30 days to 2 days prior to Mars Orbit Insertion, the spacecraft will collect a series of images of Mars' moons Phobos and Deimos. By comparing the observed position of the moons to their predicted positions, relative to the background stars, the mission team will accurately determine the position of the orbiter in relation to Mars." The probably date of picture is between February 6 to March 8, 2006. Optical Navigation Camera Rodolfo |
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Aug 16 2005, 07:02 PM
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#11
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
QUOTE (RNeuhaus @ Aug 16 2005, 01:53 PM) MRO will take pictures on Phobos (big and closer) and Deimos (small and farther)during its approach to Mars. "To help future missions in the Mars Exploration Program, Mars Reconnaissance Orbiter will carry an optical navigation camera. From 30 days to 2 days prior to Mars Orbit Insertion, the spacecraft will collect a series of images of Mars' moons Phobos and Deimos. By comparing the observed position of the moons to their predicted positions, relative to the background stars, the mission team will accurately determine the position of the orbiter in relation to Mars." The probably date of picture is between February 6 to March 8, 2006. Optical Navigation Camera Rodolfo Please forgot it, I realized that this camara will not take high resolution pictures on these Mars moons and its purpose is only for testing navigation purposes. Rodolfo |
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Oct 9 2017, 03:55 PM
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#12
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
Resurrecting a very ancient thread here - because it's finally happened. (Also I accidentally posted this in the wrong thread earlier and have now removed the erroneous post).
-------------------------------- A new release: https://mars.nasa.gov/news/8280/examining-m...ifferent-light/ with THEMIS images of Phobos. This is the image, here a composite of five frames from the animated GIF, rotated so Phobos north is up. Stickney is at far left. 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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May 10 2019, 08:33 PM
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#13
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Senior Member Group: Members Posts: 1598 Joined: 14-October 05 From: Vermont Member No.: 530 |
More news on Odyssey and Phobos:
https://www.jpl.nasa.gov/news/news.php?feature=7398 Themis imaging the full Phobos disk. |
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May 12 2019, 05:52 PM
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#14
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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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Nov 29 2023, 06:37 PM
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#15
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Solar System Cartographer Group: Members Posts: 10256 Joined: 5-April 05 From: Canada Member No.: 227 |
https://mars.nasa.gov/news/9514/nasa-orbite...f-mars-horizon/
This link has a very nice image of the horizon of Mars (or the limb) seen by the THEMIS instrument on Mars Odyssey. At the bottom of the page is a video clip of Phobos. I combined the frames to create a composite view: 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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