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Dust Storm Cuts Energy Supply Of NASA Mars Rover Spirit

Date:
November 13, 2008
Source:
NASA/Jet Propulsion Laboratory
Summary:
A dust storm on Mars has cut into the amount of sunlight reaching the solar array on NASA's Mars Exploration Rover Spirit, leaving the rover in a vulnerable state.
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The deck of NASA's Mars Exploration Rover Spirit is so dusty that the rover almost blends into the dusty background.
Credit: NASA/JPL-Caltech/Cornell

A dust storm on Mars has cut into the amount of sunlight reaching the solar array on NASA's Mars Exploration Rover Spirit, leaving the rover in a vulnerable state.

Spirit's solar array produced only 89 watt hours of energy during the rover's 1,725th Martian day, which ended on Nov. 9. This is the lowest output by either Spirit or its twin, Opportunity, in their nearly five years on Mars, and much less energy than Spirit needs each day. The charge level of Spirit's batteries is dropping so low, it risks triggering an automated response of the rover trying to protect itself.

"The best chance for survival for Spirit is for us to maintain sequence control of the rover, as opposed to it going into automated fault protection," said John Callas of NASA's Jet Propulsion Laboratory, Pasadena, Calif., project manager for Spirit and Opportunity.

Mission controllers are commanding Spirit to turn off some heaters, including one that protects a science instrument, the miniature thermal emission spectrometer, and take other measures to reduce energy consumption. The commands will tell Spirit not to try communicating again until Thursday. While pursuing that strategy the team also plans to listen to Spirit frequently during the next few days to detect signals the rover might send if it does go into a low-energy fault protection mode.

Mars weather forecasts suggest the dust storm may be clearing now or in the next few days. However, the dust falling from the sky onto Spirit's solar array panels also could leave a lingering reduction in the amount of electricity the rover can produce.

JPL, a division of the California Institute of Technology, Pasadena, manages the Mars Exploration Rover project for the NASA Science Mission Directorate, Washington.


Story Source:

The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


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NASA/Jet Propulsion Laboratory. "Dust Storm Cuts Energy Supply Of NASA Mars Rover Spirit." ScienceDaily. ScienceDaily, 13 November 2008. <www.sciencedaily.com/releases/2008/11/081112115142.htm>.
NASA/Jet Propulsion Laboratory. (2008, November 13). Dust Storm Cuts Energy Supply Of NASA Mars Rover Spirit. ScienceDaily. Retrieved April 26, 2015 from www.sciencedaily.com/releases/2008/11/081112115142.htm
NASA/Jet Propulsion Laboratory. "Dust Storm Cuts Energy Supply Of NASA Mars Rover Spirit." ScienceDaily. www.sciencedaily.com/releases/2008/11/081112115142.htm (accessed April 26, 2015).

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