Lost landers from HiRISE, The next step |
Lost landers from HiRISE, The next step |
Jan 3 2007, 08:41 PM
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#1
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Member Group: Members Posts: 428 Joined: 21-August 06 From: Northern Virginia Member No.: 1062 |
Okay, we now have definitive pictures of VL1, 2, Spirit, Opportunity, and a Pathfinder coming up soon. So, now, what would the lost landers look like, starting with Beagle, MPL, and Mars 6, which will be the easiest to find of the landers. Just curious to hear your thoughts. Thanks!
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Jan 5 2007, 09:44 AM
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#2
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
"...NEAR, Hayabusa, Phobos 1&2 and Phobos-Grunt are in a class of their own! 'Featherweight'?"
Near and Hayabusa soft-landed, even though they weren't designed to land and sit still. The Phobos mission "hopper" was essentially a hard lander, though first-impact speed would have been less than any large body hard lander. I have no idea what the predicted orbital evolution of Phobos 1 would have been after failure and communication loss in phobos-synchronized orbit. It was in an orbit with the same period as Phobos, as I recall, but somewhat elliptical, crossing the moon's orbit ahead or behind (or both) the moon as it orbited Mars. Seems likely to eventually impact Phobos, but I never heard a prediction. The Pioneer Venus probes were "atmosphere descent probes" with end-of-mission at impact, but one nightside probe survived for a second and the Day probe survived for over an hour before it ---> FRIED <---, so it ended up being an inadvertent hard lander. "Rough" lander might contrast with "smooth"... uh... I prefer Hard-impact and Soft-landing as the un-contracted ideas behind the terminology. The basic distinction is how "ruggedized" the lander must be and how protected it must be from the rough-and-tumble after uncontrolled hard impact vs. the requirement to remain stable after controlled soft impact. |
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