NASA has successfully moved one of its Mars-orbiting spacecraft into a new position to provide prompt confirmation of the upcoming Aug. 6 landing of the new Curiosity rover on the red planet.

The 11-year-old Mars Odyssey probe performed a six-second thruster burn July 24 that nudged it six minutes ahead in its orbit, NASA officials said. The maneuver placed Odyssey in a prime spot to receive signals from the Curiosity rover when it streaks toward the martian surface, and to relay news of the rover’s landing back to Earth.

“Information we are receiving indicates the maneuver has completed as planned,” Mars Odyssey project manager Gaylon McSmith of NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, Calif., said in a statement. “Odyssey has been working at Mars longer than any other spacecraft, so it is appropriate that it has a special role in supporting the newest arrival.”

The move marks something of a comeback for Odyssey, which in early June suffered a malfunction on one of its reaction wheels, instruments that help control the probe’s orientation in space. The glitch caused Odyssey to go into a precautionary safe mode July 11, which in turn affected its orbit.

As a result, officials were not sure whether Odyssey would be in the right spot during the 1-ton Curiosity rover’s touchdown. Without the corrective engine burn, Odyssey would have arrived over Curiosity’s landing site — the enormous Gale Crater — about two minutes after the rover touched down, officials said.

Curiosity, the centerpiece of NASA’s $2.5 billion Mars Science Laboratory (MSL) mission, will investigate whether the Gale area is, or ever was, capable of supporting microbial life.

Its landing is inspiring perhaps more nervousness than most other planetary touchdowns. Because Curiosity is so big, MSL engineers had to devise a new landing method for the rover. They settled on a rocket-powered sky crane, which will lower Curiosity to the martian surface on cables before flying off and intentionally crash-landing a short distance away. Odyssey is uniquely capable of relaying the landing news in real time. Two other Mars orbiters, NASA’s Mars Reconnaissance Orbiter and the European Space Agency’s Mars Express, will receive transmissions from Curiosity’s spacecraft, but they will send the communications along to Earth after a delay of several hours, officials said.

And Earth will set below the martian horizon before Curiosity touches down, meaning the MSL spacecraft will not be able to beam signals home directly.

The upshot of Odyssey’s successful maneuver is that Curiosity’s JPL-based team should learn of the landing’s outcome by 1:31 a.m. Eastern time Aug. 6.

Odyssey began science operations in February 2002, and has now worked at Mars longer than any other mission in history. The probe created the first global maps of chemical and mineral distribution on Mars, and its observations led to the discovery of vast amounts of water ice buried under the planet’s surface.

The spacecraft also has served as a communications relay station for NASA’s Spirit and Opportunity rovers, and the Phoenix lander.



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