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Phobos
Phil Stooke
post Nov 20 2010, 09:20 PM
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The rotation axis of Mars precesses and varies in obliquity. So is it a remarkable coincidence that Phobos and Deimos orbit in very close to equatorial orbits, or are their orbit planes tied to the planet's equatorial plane? That seems to be what brellis is asking, rather than a question about the rotation axis of the satellite. Alas, I know nothing about orbital dynamics.

Phil

FURTHER ORBITAL MECHANICS DISCUSSION MOVED HERE - ADMIN


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peter59
post Nov 25 2010, 09:26 PM
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Orbits 7701-8312 released. (ftp://psa.esac.esa.int/pub/mirror/MARS-EXPRESS/HRSC)
Phobos over Mars, the view more beautiful than before. The image is sharp as a razor.
Attached Image

Attached Image

Orbit 7982


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peter59
post Nov 25 2010, 09:28 PM
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The most beautiful image sequence of passage of Phobos over Mars
Orbit 7982
Attached Image
Attached Image

Attached Image
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Attached Image

High resolution camera.


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nprev
post Nov 25 2010, 09:30 PM
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Bra-VO, ESA!!! Absolutely gorgeous!


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Phil Stooke
post Nov 26 2010, 12:19 AM
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Very spectacular!

Phil


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Explorer1
post Nov 26 2010, 12:38 AM
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Like we're floating alongside.... hurry up Phobos-Grunt!
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Hungry4info
post Nov 26 2010, 12:45 AM
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Wow. That is nice!
What causes the wavy appearance of the Martian limb?


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Phil Stooke
post Nov 26 2010, 02:04 AM
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A slight rocking of the spacecraft during the scan. If it had just rotated to take this off-nadir view the long booms might not have settled down yet.

Phil


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nprev
post Nov 26 2010, 02:07 AM
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Ahhhh...yeah, makes sense; I thought it was some sort of processing artifact.


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siravan
post Nov 26 2010, 02:15 AM
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QUOTE (Hungry4info @ Nov 25 2010, 07:45 PM) *
What causes the wavy appearance of the Martian limb?


I guess a combination of Mars Express tracking Phobos and that HRSC has a linescan camera.
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tasp
post Nov 26 2010, 02:40 AM
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Strange stone, alien vapor . . . .

Fran Lebowitz
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Stu
post Nov 26 2010, 08:28 AM
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QUOTE (peter59 @ Nov 25 2010, 09:26 PM) *
Orbits 7701-8312 released. (ftp://psa.esac.esa.int/pub/mirror/MARS-EXPRESS/HRSC)


Thank you, thank you, THANK YOU for the heads up!

Last night I spent close to 3 hours browsing that data release, and it's just bursting at the seams with beautiful images. One of them I came across by accident shows Gusev crater and what must surely be the shadow of Phobos on the landscape to the south. ( I've tweaked the contrast a teeny bit to make it look a bit more dramatic )

Attached Image


ohmy.gif


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Hungry4info
post Nov 26 2010, 09:17 AM
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Wow!


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Astrophil
post Nov 26 2010, 01:37 PM
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That Gusev picture is fabulous.
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post Nov 26 2010, 03:09 PM
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MEx wide-angle images have always impressed me, but, boy, this set is exceptional! Well-spotted, Stu.


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