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HiRISE captures images of Deimos
volcanopele
post Mar 9 2009, 06:35 PM
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The HiRISE team today released two images of Mars' moon Deimos, taken on February 21, 2009:

http://hirise.lpl.arizona.edu/deimos.php
http://photojournal.jpl.nasa.gov/catalog/PIA11826

Nice confirmation that my MRO model in Celestia works well.


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elakdawalla
post Mar 9 2009, 06:59 PM
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Awesome, thanks for the heads up.

Reality check: I am figuring out the geometry, using my marvelous cut-and-assemble Deimos model. It's telling me that the two photos are of the sub-Mars hemisphere (only hemisphere it could be, given MRO's orbit, so that's reassuring), but it appears they've been released with the south pole up. Do others agree?

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ngunn
post Mar 9 2009, 07:09 PM
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Anyone for 3-D? It ought to work at least for the upper right portion of those images.
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volcanopele
post Mar 9 2009, 07:13 PM
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Yep South pole is up. In the third view, the blue arrow is from the north pole, the red arrow from the new sub-Mars point, the green arrow from the anti-apex point:


Attached thumbnail(s)
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volcanopele
post Mar 9 2009, 07:14 PM
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QUOTE (ngunn @ Mar 9 2009, 12:09 PM) *
Anyone for 3-D? It ought to work at least for the upper right portion of those images.

It looks like the central lat and lon is pretty close to being the same, making stereo pretty difficult. The different lighting conditions don't help either.


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volcanopele
post Mar 9 2009, 09:13 PM
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Another way to look at the geometry of these images:


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elakdawalla
post Mar 9 2009, 09:17 PM
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Yup, I had my model in my hand as I was figuring it out! Yours seems to have been assembled more neatly than mine though smile.gif


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volcanopele
post Mar 9 2009, 09:19 PM
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Any engineering problem can be solved with the abundant application of tape.


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ElkGroveDan
post Mar 9 2009, 11:05 PM
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What's the orbital period on that massive iPod Jason?


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ilbasso
post Mar 10 2009, 12:35 AM
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QUOTE (ElkGroveDan @ Mar 9 2009, 07:05 PM) *
What's the orbital period on that massive iPod Jason?


I think it's the Monolith from "2001", updated to 2009.


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Phil Stooke
post Feb 22 2010, 10:31 PM
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I'm just starting a new Deimos mosaic for use in my atlas. I will post it here in a day or two. This is the Viking mosaic I made a decade ago, with the two MRO images added. They allow significant improvements in some areas, especially near the prime meridian and on the ridge that extends west along the equator from 0 longitude.

Phil


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Phil Stooke
post Feb 23 2010, 04:55 PM
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OK, here's a new Simple Cylindrical map of Deimos, mostly Viking but with the two MRO views added in.

Phil

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Nirgal
post Feb 23 2010, 08:30 PM
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QUOTE (ngunn @ Mar 9 2009, 08:09 PM) *
Anyone for 3-D?


Here is a very quick trial at a single-image shape-from-shading 3D reconstruction of the surface (un-optimized and without the exact viewing parameters, light source direction etc.)

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Phil Stooke
post Feb 25 2010, 07:29 PM
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Again using the Deimos map incorporating MRO images - here's a new map of Deimos in a different map projection from the cylindrical - this is designed to illustrate the shape of the body as well as the locations of surface features.

Phil

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Phil Stooke
post Feb 26 2010, 02:57 PM
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How do you go from the cylindrical map of Deimos to the two 'hemispheres' ? Here's a comparison showing an intermediate step, an azimuthal equidistant projection in two hemispheres.

Phil

Attached Image


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