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Extra info for A Scientific Rationale for Mobility in Planetary Environments (Compass Series)
Mobility of this form would allow the deployment of instruments to measure subsurface temperature gradients, in situ composition measurement, and the collection of samples for analysis on board a lander or rover; • Devices for collecting coherent samples, and facilities to maintain them in a pristine thermal environment for eventual return to Earth; • A cryobot for melting into the ice shell of Europa, to depths on the order of kilometers, to deploy instruments either within the ice or within the underlying water, if it is present; and • A small submarine, deployed by the cryobot, to explore the subsurface water ocean, if it is present.
The primary factors determining the required lifetimes of the balloons are the wind speeds. These vary greatly Copyright © National Academy of Sciences. All rights reserved. html THE ROLE OF MOBILITY IN SOLAR SYSTEM EXPLORATION 23 from place to place on Jupiter but tend to be strong (~50 to 100 m/s). At these speeds, a lifetime of less than a week is probably sufficient to traverse a hot spot. Considerably longer lifetimes would, however, be required to sample a sizable portion of the planet. Knowledge of the locations of the balloons with respect to gross atmospheric features will be required.
1). 25 m2 solar cell array. Navigation was controlled from Earth, but the rover was capable of avoiding obstacles by using laser sensors and a simple avoidance protocol included in its on-board processor (Intel 80C85). Navigation was accomplished with two forward-looking monochromatic cameras that provided a stereoscopic view of the terrain. Sojourner’s maximum speed was 1 cm/s for a total possible range of about 60 m/day, assuming continuous driving and no obstacles; actual speeds and distance traveled were much less.
A Scientific Rationale for Mobility in Planetary Environments (Compass Series) by National Research Council Staff