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Phobos
Guest_Sunspot_*
post Nov 11 2004, 11:46 PM
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http://www.esa.int/SPECIALS/Mars_Express/

These images, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft, are Europe’s highest-resolution pictures so far of the Martian moon Phobos.

http://www.esa.int/SPECIALS/Mars_Express/SEM21TVJD1E_0.html
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Phil Stooke
post Nov 18 2006, 05:49 AM
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Here's a Mars Express Phobos image from orbit 1607- a distant view. There is a close view on this orbit, but I haven't got the patience to download 600 Mb of mostly dark sky.

Phil

Attached Image


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djellison
post Nov 18 2006, 07:12 AM
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What is it with the PDS/PSA and their total hatred of Zip/Rar/GZ'ing files that actuall comrpess REALLY well...

At least the small bodies node have the right attitude for this stuff.

Doug
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Guest_PhilCo126_*
post Nov 18 2006, 09:02 AM
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Waaw thanks for sharing those!
ohmy.gif
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Phil Stooke
post Nov 18 2006, 01:31 PM
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Mea culpa - I see now that the second image from that orbit, the 600 MB file, is of Mars, not Phobos.

Phil


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tedstryk
post Nov 19 2006, 02:13 AM
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600 MB? The biggest Phobos images from that orbit are about 2 MB. Where were you looking? I was on the PDS Geosciences node.

Here are the two highest resolution images from this orbi (1607).



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Phil Stooke
post Nov 19 2006, 03:22 AM
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I checked this after reading your question, Ted. The Data directory has the full res images, and for the largest image from that orbit it says:

Wednesday, April 26, 2006 6:49 AM 697587740 h1607_0009_nd2.img

697 Mb. But I was mistaken in thinking it was Phobos, I assumed that without checking - the second set of images from 1607 are of Mars. Even so, the largest Phobos image on that orbit, the nd2 image, is 9548940 bytes. Your images are the "super-resolution" images which are a lot smaller.

There are some very similar images of Phobos in orbit 1574 as well.

Phil


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Phil Stooke
post Nov 19 2006, 04:02 PM
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- and another in orbit 1558, but this one is from orbit 1212, the nadir (nd2) image:

Attached Image


Phil


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Phil Stooke
post Nov 19 2006, 10:37 PM
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I'm still exploring the Mars Express Phobos images. This, I think, is the highest resolution image yet, from orbit 756. The original file was 169 MB, but largely dark sky. I have played with the contrast a bit to brighten the terminator. Several blocks casting shadows can be found along the terminator.

Phil

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ugordan
post Nov 20 2006, 07:54 AM
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Nice image, Phil. Where do the JPEG-ish artifacts come from, was this one lossy compressed before transmission?


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Phil Stooke
post Nov 20 2006, 02:20 PM
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No, I compressed it severely to reduce the file size for posting on UMSF.

Phil


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dilo
post Nov 20 2006, 07:45 PM
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Very impressive shot, Phil... resolution should be around 3m/pixel!
The file you posted is only 460k, I think is worth to re-post a less compressed version... please!


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dilo
post Nov 20 2006, 07:52 PM
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sorry, wrong re-post.


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Phil Stooke
post Nov 20 2006, 11:57 PM
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I will put the uncompressed image on an external website tomorrow.

Phil


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tedstryk
post Nov 21 2006, 12:14 AM
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QUOTE (Phil Stooke @ Nov 20 2006, 11:57 PM) *
I will put the uncompressed image on an external website tomorrow.

Phil



The best I could do with 16 bit lossless compression was over 9 MB!


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