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MESSENGER Mission News
July 27, 2011

MESSENGER Makes Another Successful Orbit Adjustment
The MESSENGER spacecraft continued to fine-tune its orbit around Mercury yesterday afternoon when mission controllers at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., successfully executed the second orbit-correction maneuver of the mission.

The 3-minute, 8-second engine burn stretched the spacecraft’s orbit around the innermost planet from 11 hours 48 minutes to a precise 12 hours. This second of an expected five maneuvers planned for the mission’s primary orbital phase began at 5:20 P.M. EDT, and used approximately 1.9 kilograms of fuel.

“MESSENGER’s first orbit-correction maneuver, which took place in June, reset the periapsis altitude of the orbit to 200 kilometers, but also shortened the orbital period. This second maneuver has reset the period to its nominal value of 12 hours,” says APL’s Peter Bedini, MESSENGER project manager.

MESSENGER Mission Systems Engineer Eric Finnegan, of APL, said the engine burn was “on target and a sweet success. We’re precisely where we need to be to continue to capture amazing data from Mercury’s surface.” The next orbit-correction maneuver is scheduled for September 7 and will lower the periapsis altitude from about 470 kilometers back to 200 kilometers.

MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) is a NASA-sponsored scientific investigation of the planet Mercury and the first space mission designed to orbit the planet closest to the Sun. The MESSENGER spacecraft launched on August 3, 2004, and entered orbit about Mercury on March 17, 2011 (March 18, 2011 UTC), to begin a yearlong study of its target planet. Dr. Sean C. Solomon, of the Carnegie Institution of Washington, leads the mission as Principal Investigator. The Johns Hopkins University Applied Physics Laboratory built and operates the MESSENGER spacecraft and manages this Discovery-class mission for NASA.

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