Extricating Spirit, Digging out from Troy |
Extricating Spirit, Digging out from Troy |
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#901
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![]() Member ![]() ![]() ![]() Group: Members Posts: 239 Joined: 18-December 07 From: New York Member No.: 3982 ![]() |
5 downsampled navcam frames from sol 2078 are down. Someone might want to make an animation.
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#902
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![]() Administrator ![]() ![]() ![]() ![]() Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 ![]() |
Scott told me that they can actually move some centimeters without affecting the radio science campaign, so they can continue working on extrication efforts up to a point even while they are considered "stationary." In the event that they find they are successful and could move so much that they would ruin the radio science experiment, my impression is that the radio science experiment would be completed first, but obviously that's a decision that would be made if and when they actually face that situation.
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#903
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![]() Member ![]() ![]() ![]() Group: Members Posts: 214 Joined: 30-December 05 Member No.: 628 ![]() |
Scott told me that they can actually move some centimeters without affecting the radio science campaign, so they can continue working on extrication efforts up to a point even while they are considered "stationary." Sols 1406 to 1782 (=386 sols) saw only small movements down the slope at Winter Haven 3. Tesh's maps are not quite accurate enough to estimate the minimum number of centimeters moved over a six month span, but whatever it may be, isn't that an upper bound for the amount of permissible movement during the core composition experiment? IIRC Spirit was able to call home during the previous winter, and yet the stationary observations that could have been done then were apparently not accurate enough. Anyway, it seems to me that if we are going to perform such a sensitive and difficult-to-repeat experiment, the observation error ought to be reduced as small as we can possibly make it by just keeping the rover stationary. I don't understand how some error can be permissible and more error can be impermissible. |
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#904
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![]() Martian Photographer ![]() ![]() ![]() Group: Members Posts: 352 Joined: 3-March 05 Member No.: 183 ![]() |
IIRC Spirit was able to call home during the previous winter, and yet the stationary observations that could have been done then were apparently not accurate enough. That presumes that any old observations will do--not true--or that "could have been done" = "were done"--not true (at least in the quantities needed). The experiment needs passes other than what would be chosen normally, extra DSN resources, and extra energy on Spirit. Precise speed measurements with doppler shift require a to/from velocity component, so Earth has to be low in the sky. Winter direct-to-Earth comm tends to be associated with Earth being high in the sky. |
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