Extricating Spirit, Digging out from Troy |
Extricating Spirit, Digging out from Troy |
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#1
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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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#2
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 ![]() |
If Spirit manages to move over a meter wouldn't they still be able to do the measurements if they knew the distance moved to an accuracy of less than a cm?
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#3
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 ![]() |
If Spirit manages to move over a meter wouldn't they still be able to do the measurements if they knew the distance moved to an accuracy of less than a cm? I'm going to say "no" and go way out on a limb with why I think not. With all the variables involved in the absolute distance between Earth and Mars in three dimensions, my guess would be that the uncertainty for the location is not linear since we are looking at variations along all three axis in 3D space. The equation accounting for the uncertainty of the distance from Spirit and a defined point on Earth more than likely describes the volume of a sphere. By changing Spirit's position I would assume that the radius of that uncertainty sphere is being increased accordingly, and therefore its volume is increasing exponentially. Scott mentioned to Emily they could move Spirit several centimeters. If that means the base uncertainty is something like 6 centimeters, the uncertainty sphere would be 904 cm(3) in volume. If you move the rover a distance of one meter (100 cm) then the radius would be 106 cm with a volume of 4,986,387 cm(3). Comparing the volumes of the two spheres [4,986,387 cm(3)]/[904 cm(3)] it would seem that by moving the rover one meter it creates an uncertainty over 5500 times as large as the 6 cm uncertainty where she now sits. It certainly shows why extreme minimal movement is necessary for this experiment. -------------------- If Occam had heard my theory, things would be very different now.
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