Messenger Lines Up For Earth Swingby

INNER PLANETS

Click here to see graphics of Messenger's configuration during the maneuver

Baltimore MD (SPX) Jul 25, 2005
Messenger's fifth trajectory correction maneuver lasted just 23 seconds and adjusted its velocity by less than half-a-foot per second. But the fleeting July 21 maneuver went a long way in keeping Messenger on track for the upcoming gravity-assist flyby of Earth.

Carried out by two small thrusters that poke through Messenger's sunshade, the maneuver pinpointed the craft for a closest approach of 1,458 miles (2,347 kilometers) over central Asia at 3:13 p.m. EDT on Aug. 2.

Mission design team members say that directing Messenger along just the right path above Earth will mean smaller course-correction maneuvers on the way to the 2006 gravity-assist flyby at Venus - ultimately saving fuel for later in the mission.

Today's maneuver started at 2 p.m. EDT; mission controllers at The Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland, verified the start of the maneuver within 14 seconds, when the first signals indicating spacecraft thruster activity reached NASA's Deep Space Network tracking station outside Madrid, Spain.

The spacecraft was 2.6 million miles (4.3 million kilometers) from Earth at the time, speeding around the Sun at 66,738 miles (107,404 kilometers) per hour.

The Earth flyby sends the spacecraft toward Venus; the first of two Venus flybys is planned for October 2006.

INNER PLANETS

Messenger Sets Course For Earth Flyby

Laurel MD (SPX) Jun 29, 2005
A short maneuver on June 23 kept Messenger on track for its Aug. 2 flyby of Earth � the major gravity assist that starts the next leg of the spacecraft's journey toward Mercury.

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