Mars Odyssey orbiter repositioned to phone home Mars landing

Jul 25, 2012
NASA's Mars Odyssey spacecraft passes above Mars' south pole in this artist's concept. The spacecraft has been orbiting Mars since October 24, 2001. Image credit: NASA/JPL

(Phys.org) -- NASA's Mars Odyssey spacecraft has successfully adjusted its orbital location to be in a better position to provide prompt confirmation of the August landing of the Curiosity rover.

NASA's spacecraft carrying Curiosity can send limited information directly to Earth as it enters Mars' atmosphere. Before the landing, Earth will set below the Martian horizon from the descending spacecraft's perspective, ending that direct route of communication. Odyssey will help to speed up the indirect .

NASA reported during a July 16 news conference that Odyssey, which originally was planned to provide a near-real-time communication link with Curiosity, had entered safe mode July 11. This situation would have affected communication operations, but not the rover's landing. Without a repositioning maneuver, Odyssey would have arrived over the landing area about two minutes after Curiosity landed.

A spacecraft thruster burn Tuesday, July 24, lasting about six seconds has nudged Odyssey about six minutes ahead in its orbit. Odyssey is now operating normally, and confirmation of Curiosity's landing is expected to reach Earth at about 10:31 p.m. PDT on Aug. 5 (early Aug. 6, EDT and Universal Time), as originally planned.

"Information we are receiving indicates the maneuver has completed as planned," said Mars Odyssey Project Manager Gaylon McSmith of NASA's Jet Propulsion Laboratory, Pasadena, Calif. "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."

Two other Mars orbiters, NASA's Mars Reconnaissance Orbiter and the 's , also will be in position to receive radio transmissions from the Mars Science Laboratory during its descent. However, they will be recording information for later playback, not relaying it immediately, as only Odyssey can.

Odyssey arrived at Mars in 2001. Besides conducting its own scientific observations, it has served as a communication relay for NASA's Spirit and Opportunity Mars rovers and the Phoenix lander on the Martian surface. NASA plans to use Odyssey and the as communication relays for Curiosity during that rover's two-year prime mission on Mars.

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User comments : 2

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gmurphy
5 / 5 (3) Jul 25, 2012
It'd be great if they could get a picture of the lander descending, like they for Phoenix in 2008.
yyz
5 / 5 (2) Jul 25, 2012
@gmurphy

Agreed. Although the viewing angle won't be as favorable (MRO will be looking nearly straight down at Curiosity as opposed to the oblique view of the Phoenix landing), the size of Curiosity's parachute, the largest ever used on Mars, should cover four times as many pixels as Phoenix' did.

Video of the trajectories of MRO/Curiosity:

http://www.youtub...BDnJNW-8

Phoenix spotted by MRO/HiRISE against Heimdall crater:

https://planetary...full.jpg

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