CRISM Corner |
CRISM Corner |
Nov 5 2007, 10:17 PM
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#76
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Member Group: Members Posts: 384 Joined: 4-January 07 Member No.: 1555 |
And, just for fun, here is one of the Columbia Hills: and one of Victoria Crater (I think...) Slinted - Those are really neat images. The Columbia Hills one, if nothing else, shows there there is certainly no shortage of various sizes of impact craters in the vicinity, consistent with the hypothesis that the Home Plate deposits could just as well be a small erosional remnant of impact surge as of volcanic surge. The "Victoria Crater" one (actually, as noted in a later post, Endeavor and the top half of Erebus) clearly shows a linear pattern of what appear to be crater ejecta, radiating topwards either from Victoria or, more likely, from what appears to be an older, larger, sand-filled crater just to its left - consistent with the hypothesis that the finely layered rocks of Meridiani could be fine impact ejecta (impact surge deposits) resulting from multiple impacts. Such a radiating pattern is difficult to see in simple visible images. Keep up the exploratory imaging work. You could make some discoveries! -- HDP Don |
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Nov 27 2007, 05:34 PM
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#77
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Member Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
CRISM captures Phobos and Deimos:
http://crism.jhuapl.edu/gallery/featuredIm...amp;image_id=98 QUOTE These CRISM measurements are the first spectral measurements to resolve the disk of Deimos, and the first of this part of Phobos to cover the full wavelength range needed to assess the presence of iron-, water-, and carbon-containing minerals. Looks like the page has a broken image; the image is here. -------------------- "I got a call from NASA Headquarters wanting a color picture of Venus. I said, “What color would you like it?” - Laurance R. Doyle, former JPL image processing guy
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Nov 27 2007, 06:27 PM
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#78
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
Phobos 2 images show the extent of the blue-grey unit on the other hemisphere. This nicely fills the gap in Phobos 2 imaging. Viking colour was useless for this type of work.
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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Dec 21 2007, 10:45 PM
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#79
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Member Group: Members Posts: 267 Joined: 5-February 06 Member No.: 675 |
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Mar 20 2008, 07:10 PM
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#80
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Good article on clay identification on Mars using CRISM:
http://www.space.com/searchforlife/080320-...mars-water.html And Figure 1A-C (here.) is an excellent example of how to use spectral information to identify clay minerals. This is the key to the clay groups and spectral line colors in Figure 1A-B: blue = Al-phyllosilicate orange = Fe/Mg-smectite green = the hydrated silica/mica (Look carefully at the subtle differences in the valleys near 1.9 um, 2.2 um and 2.3 um for the different minerals. I had to stare at it for a few minutes before I saw the differences.) -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Apr 25 2008, 08:47 PM
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#81
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Recent article in Icarus:
Cloutis et al. Icarus 195 (2008) 140-168. "Spectral reflectance properties of minerals exposed to simulated Mars surface conditions." doi: 10.1016/j.icarus.2007.10.028. (pay-for article, Abstract available here) Lotsa mineral spectra. From skimming the article, it appears that for most minerals exposure to martian conditions doesn't drastically change the reflectance spectra. (The big exception was in some of the Fe(III) sulfates that did visibly change the color based on exposure time). So for the most part (and especially for carbonates, hydroxides, and hydrates), it means that the spectra you get on Earth are what you would expect on Mars. There is nothing "weird" going on.... -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Apr 25 2008, 11:04 PM
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#82
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Oct 7 2017, 09:14 PM
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#83
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
CRISM data continues to spur scientific papers, and in this case researchers from Hong Kong have identified an ancient large ocean on Mars.
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Oct 9 2017, 03:34 AM
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#84
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Member Group: Members Posts: 205 Joined: 14-April 06 From: Seattle, WA Member No.: 745 |
The study, published in Nature Communications, is openly available. It is a fascinating read.
Ancient hydrothermal seafloor deposits Paul Niles at Johnson Space Center was a co-author on the study. NASA has a press release: Mars Study Yields Clues to Possible Cradle of Life |
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Oct 10 2017, 03:34 AM
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#85
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Two posts deleted due to a mistake. No harm, no foul, just housekeeping.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 10 2017, 01:20 PM
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#86
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Thank you Ron for the heads up with that link. =)
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Nov 26 2018, 04:16 AM
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#87
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Member Group: Members Posts: 238 Joined: 15-January 13 Member No.: 6842 |
Somewhat worrying news about the validity of CRISM data for perchlorates: https://agupubs.onlinelibrary.wiley.com/doi...29/2018GL080077
The paper shows there's a processing artifact that mimics the apeparance of several minerals, including perchlorates (which allow the existence of briny liquid water at very cold temperatures). -------------------- Curiosity rover panoramas: http://www.facebook.com/CuriosityRoverPanoramas
My Photosynth panoramas: http://photosynth.net/userprofilepage.aspx...;content=Synths |
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