http://www.jpl.nasa.gov/news/news.cfm?release=2004-276

Mars Exploration Rover Mission Status
November 11, 2004

Operators of NASA's Mars Exploration Rover Opportunity have determined that a proposed route eastward out of "Endurance Crater" is not passable, so the rover will backtrack to leave the crater by a southward route, perhaps by retracing its entry path.

"We've done a careful analysis of the ground in front of Opportunity and decided to turn around," said Jim Erickson, rover project manager at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "To the right, the slope is too steep -- more than 30 degrees. To the left, there are sandy areas we can't be sure we could get across."

Before turning around, Opportunity will spend a few days examining the rock layers in scarp about 10 meters (33 feet) high, dubbed "Burns Cliff." From its location at the western foot of the cliff, the rover will use its panoramic camera and miniature thermal emission spectrometer to collect information from which scientists hope to determine whether some of the layers were deposited by wind, rather than by water. The rover will not reach an area about 15 meters (50 feet) farther east where two layers at different angles meet at the base of the cliff.

"We have pushed the vehicle right to the edge of its capabilities, and we've finally reached a spot where we may be able to answer questions we've been asking about this site for months," said Dr. Steve Squyres, rover principal investigator at Cornell University, Ithaca, N.Y. "But after we're done here, it'll be time to turn around. Going any farther could cut off our line of retreat from the crater, and that's not something anybody on the team wants to do."

Opportunity entered the stadium-size crater on June 8 at a site called "Karatepe" along the crater's southern rim. Inside the crater, it has found and examined multiple layers of rocks that show evidence of a wet environment in the area's distant past.

Opportunity and its twin, Spirit, successfully completed their primary three-month missions on Mars in April. NASA has extended their missions twice, most recently on Oct. 1, because the rovers have remained in good condition to continue exploring Mars longer than anticipated.

Engineers have finished troubleshooting an indication of a problem with steering brakes on Spirit. The brakes are designed to keep the rover wheels from being bumped off course while driving. Spirit has intermittently sent information in recent weeks that the brakes on two wheels were not releasing properly when the rover received commands to set a new course. Testing and analysis indicate that the mechanism for detecting whether the brakes are released is probably sending a false indication. The rover team will disregard that signal and presume the brakes have actually released properly when commanded to do so. This anomaly has not been observed on the Opportunity rover.

"We're going back to using the full steering capabilities of Spirit," Erickson said.

JPL, a division of the California Institute of Technology in Pasadena, manages the Mars Exploration Rover project for NASA's Science Mission Directorate, Washington, D.C. Additional information about the project is available from JPL at http://marsrovers.jpl.nasa.gov/ and from Cornell University, Ithaca, N.Y., at http://athena.cornell.edu.

That's probably the right decision. Don't gamble and never get out! But I have a feeling the rover could have made it

Ahhh well they will hopefully not spend as much time getting out as they did getting in

And great to hear Spirit has full steering again!

In that article there is a cool image that shows how steep the slope really is. I was actually dumbfounded that the rovers drivers decided to push the rover that far...

I think it's a good decision not to go farther, since we have a lot more exploring to do (including Victoria's crater - we gotta see the view of that one!)

Well - we all knew they'd be doing it anyway

Doug

I was just waiting for you to say it dj... Pity there is no gloating smiley eh?

But, Opp. is still moving forward, in the direction of the exit hatch:

http://qt.exploratorium.edu/mars/opportuni...MEP1201L0M1.JPG

http://qt.exploratorium.edu/mars/opportuni...MIP1214L0M1.JPG

Why would they do that? Stereo imaging? a RAT?

"The rover team has decided that the farthest Opportunity can safely advance along the base of the cliff is close to the squarish white rock near the center of this image."