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Mars Rover Driving Leaves Distinctive Tracks

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#1    Waspie_Dwarf

Waspie_Dwarf

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Posted 20 May 2011 - 12:58 AM

Mars Rover Driving Leaves Distinctive Tracks

05.18.11



When NASA's Opportunity Mars rover uses an onboard navigation capability during backward drives, it leaves a distinctive pattern in the wheel tracks visible on the Martian ground.

The pattern appears in an image posted at http://photojournal.jpl.nasa.gov/catalog/PIA14129.

Posted Image
A dance-step pattern is visible in the
wheel tracks near the left edge of this
scene recorded by the navigation camera
on NASA's Mars Exploration Rover
Opportunity during the 2,554th Martian
day, or sol, of the rover's work on Mars
(April 1, 2011).
Image credit: NASA/JPL-Caltech

› Full image and caption
› Stereo view


The rover team routinely commands Opportunity to drive backward as a precaution for extending the life of the rover's right-front wheel, which has been drawing more electrical current than the other five wheels. Rover drivers can command the rover to check for potential hazards in the drive direction, whether the rover is driving backward or forward. In that autonomous navigation mode, the rover pauses frequently, views the ground with the navigation camera on its mast, analyzes the stereo images, and makes a decision about proceeding.

When the drive is backward, the drive-direction view from the navigation camera is partially blocked by an antenna in the middle of the rover. Therefore, at each pause to check for hazards, the rover pivots slightly to the side to get a clear view. If it sees no hazard, it turns back to the direction it was going and continues the drive for about another 4 feet (1.2 meters) before checking again. This set of activities leaves tracks showing the slight turnout on a rhythmically repeated basis, like a dance step.

Opportunity has driven more than 1.6 miles (about 2.6 kilometers) since leaving "Santa Maria" crater in late March and resuming a long-term trek toward the much larger Endeavour crater. Opportunity has now driven more than 18 miles (29 kilometers) on Mars.

Opportunity and its twin rover, Spirit, completed their three-month prime missions on Mars in April 2004. Both rovers continued in years of bonus, extended missions. Both have made important discoveries about wet environments on ancient Mars that may have been favorable for supporting microbial life. Spirit has not communicated with Earth since March 2010.

NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Exploration Rover Project for the NASA Science Mission Directorate, Washington.

More information about the rovers is online at: http://www.nasa.gov/rovers. You can follow the rovers on Facebook at: https://www.facebook.com/mars.rovers and on Twitter @MarsRovers . A full list of JPL’s social media accounts is at: http://www.jpl.nasa.gov/social/.

Guy Webster 818-354-6278
Jet Propulsion Laboratory, Pasadena, Calif.
guy.webster@jpl.nasa.gov

2011-148


Source: NASA - Mars Exploration Rovers - News & Media Resources

Edited by Waspie_Dwarf, 16 June 2012 - 12:11 AM.
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