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CRISM Corner
dburt
post Nov 5 2007, 10:17 PM
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QUOTE (slinted @ Nov 1 2007, 08:00 AM) *
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. smile.gif

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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Del Palmer
post Nov 27 2007, 05:34 PM
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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.


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Phil Stooke
post Nov 27 2007, 06:27 PM
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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


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SteveM
post Dec 21 2007, 10:45 PM
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There are many new CRISM images of potenital MSL landing sites here.

Steve M
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Juramike
post Mar 20 2008, 07:10 PM
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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



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Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Juramike
post Apr 25 2008, 08:47 PM
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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


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elakdawalla
post Apr 25 2008, 11:04 PM
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Anyone notice this?

CRISM Data Products: Viewing Features on Mars Web site

--Emily


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TheAnt
post Oct 7 2017, 09:14 PM
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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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Ron Hobbs
post Oct 9 2017, 03:34 AM
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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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nprev
post Oct 10 2017, 03:34 AM
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Two posts deleted due to a mistake. No harm, no foul, just housekeeping. smile.gif


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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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TheAnt
post Oct 10 2017, 01:20 PM
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Thank you Ron for the heads up with that link. =)
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