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Surveyor Starts Final Aerobraking
JPL - January 28, 1999 - Mars Global Surveyor began entered its final aerobraking phase, known as the "walk-out" phase. During this final stage of aerobraking, the spacecraft will be bumped higher in four four steps.

January 28 the spacecraft's orbit was raised from a closest approach of 100 kilometers (62.5 miles) to 103 kilometers (64.4 miles) above the planet's surface. As the closest approach, or periapsis, is adjusted, the spacecraft's apoapsis, or farthest point from Mars, will continue to diminish until Global Surveyor is in a two-hour orbit over the poles of the planet.

The flight team at the Jet Propulsion Laboratory in Pasadena and Lockheed Martin Astronautics in Denver will uplink aerobraking sequences twice a day over the next six days to adjust both the nearest and farthest points of the spacecraft's orbit. These sequences will allow the spacecraft to execute one propulsive maneuver each day. The flight team will track Global Surveyor's altitude over the Martian surface during each of 12 daily passes through the Martian atmosphere.

Aerobraking is expected to end on February 4, when Global Surveyor will be instructed to fire its main rocket engine and raise its orbit completely out of the Martian atmosphere. The burn will be executed when the flight team has determined that the spacecraft's apoapsis has dropped from the current 1,000 kilometers (625 miles) to the designated 450 kilometers (279 miles) over the Martian surface.
Over the next two weeks, the spacecraft's closest approach over Mars will slowly drift south until it has moved into a Sun-synchronous orbit, in which the spacecraft will cross the equator at about 2 a.m. local solar time on Mars each orbit. Flight controllers will again fire the spacecraft's main engine on February 18 and perform a final "transfer to mapping orbit" burn, which will lower Global Surveyor's closest approach over Mars from 405 kilometers (253 miles) to approximately 379 kilometers (237 miles).

Mars Global Surveyor remains in excellent health more than two years after its launch. The magnetometer, one of six scientific instruments onboard the spacecraft, was turned off today for completion of the aerobraking phase. It will be turned on again on February 10, and the rest of the science payload will be powered on for calibration tests beginning on February 25. A "pre-mapping phase" in which the spacecraft will acquire one complete global map of Mars will be conducted March 8-28.

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    Mars 98 Reports From Spacer.Com

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  • Mars Surveyor 98 - NASA portal site to Mars Missions
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