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Posted by: volcanopele Mar 9 2009, 06:35 PM

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.

Posted by: elakdawalla Mar 9 2009, 06:59 PM

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?

--Emily

Posted by: ngunn Mar 9 2009, 07:09 PM

Anyone for 3-D? It ought to work at least for the upper right portion of those images.

Posted by: volcanopele Mar 9 2009, 07:13 PM

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:

Posted by: volcanopele Mar 9 2009, 07:14 PM

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.

Posted by: volcanopele Mar 9 2009, 09:13 PM

Another way to look at the geometry of these images:

Posted by: elakdawalla Mar 9 2009, 09:17 PM

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

Posted by: volcanopele Mar 9 2009, 09:19 PM

Any engineering problem can be solved with the abundant application of tape.

Posted by: ElkGroveDan Mar 9 2009, 11:05 PM

What's the orbital period on that massive iPod Jason?

Posted by: ilbasso Mar 10 2009, 12:35 AM

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

Posted by: Phil Stooke Feb 22 2010, 10:31 PM

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

Posted by: Phil Stooke Feb 23 2010, 04:55 PM

OK, here's a new Simple Cylindrical map of Deimos, mostly Viking but with the two MRO views added in.

Phil

Posted by: Nirgal Feb 23 2010, 08:30 PM

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.)

Posted by: Phil Stooke Feb 25 2010, 07:29 PM

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

Posted by: Phil Stooke Feb 26 2010, 02:57 PM

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