Progress Inch-By-Inch For Opportunity

MARSDAILY

This mosaic of navigation-camera frames from Opportunity, presented in a vertical projection, shows the rover's position after it dug itself to wheel-hub depth in a small dune during its 446th martian sol (April 26, 2005).

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Pasadena CA (JPL) - May 17, 2005
On Opportunity's first three drives to get out of the sand trap, the rover has advanced a total of 7.4 centimeters (2.9 inches) in getting off the dune.

Each of the first two drives - one on sol 463 and one on sol 465 - turned the wheels about two and a half rotations, enough to drive two meters (7 feet) if there were no slippage.

Images from the hazard-avoidance cameras taken during the drives show that some of caked powder adhering to wheels between cleats had come off. The team was encouraged by the results, and decided go ahead with a 4-meter (13-foot) commanded drive for sol 466.

Sol-by- sol summaries:
Sol 465 (May 15, 2005): Opportunity rotated its wheels in a series of 10 steps, each step enough to roll 20 centimeters (7.9 inches) if there were no slippage.

The wheels are slipping a great deal in the sand of the dune, but the rover advanced better than anticipated from simulated tests, covering 1.9 centimeters (0.7 inch). The rover used its panoramic camera for observations of the sky and dunes.

Sol 466 (May 16, 2005): Results from the sol 465 drive were good (some wheel cleats are clean and the rover is making forward progress), so the team commanded a drive that, if there were no slippage, would roll 4 meters (13 feet), consisting of ten 40-centimeter (16 inch) steps.

Opportunity gained an additional 2.7 centimeters (1.1 inch). The panoramic camera made more observations of the atmosphere and dunes.

MARSDAILY

Opportunity Turns Its Wheels

Ithica CA (JPL) May 17, 2005
The Mars Rover teams have contunied their slow and methodical approach to getting their 400 million dollar robots out of a sand dune on Mars some 191 million kilometers away.

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