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NASA's OSIRIS-REx executes fourth asteroid approach maneuver
by Staff Writers
Greenbelt MD (SPX) Nov 14, 2018

illustration only

NASA's OSIRIS-REx spacecraft executed its fourth Asteroid Approach Maneuver (AAM-4) yesterday. The spacecraft fired its Attitude Control System (ACS) thrusters to slow the spacecraft from approximately 0.31 mph (0.14 m/sec) to 0.10 mph (0.04 m/sec).

The ACS thrusters are capable of velocity changes as small as 0.02 mph (0.01 m/sec).

The mission team will continue to examine telemetry and tracking data over the next week to verify the new trajectory. The maneuver targeted the spacecraft to fly through a corridor designed for the collection of high-resolution images that will be used to build a shape model of Bennu.

With the execution of AAM-4, the OSIRIS-REx spacecraft concludes a six-week series of Bennu approach maneuvers. AAM-1 and AAM-2, which executed on Oct. 1 and Oct. 15 respectively, slowed the spacecraft by a total of approximately 1,088 mph (486 m/sec).

AAM-3 and AAM-3A, which executed on Oct. 29 and Nov. 5 respectively, further refined the spacecraft's trajectory and speed to set the conditions for a successful AAM-4 maneuver.

After a final correction maneuver scheduled for Nov. 30, the spacecraft will be on track to arrive at a position 12 miles (20 km) from Bennu on Dec. 3.


Related Links
OSIRIS-REx
Asteroid and Comet Mission News, Science and Technology


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IRON AND ICE
Cosmic Detective Work: Why We Care About Space Rocks
Pasadena CA (JPL) Nov 08, 2018
The entire history of human existence is a tiny blip in our solar system's 4.5-billion-year history. No one was around to see planets forming and undergoing dramatic changes before settling in their present configuration. In order to understand what came before us - before life on Earth and before Earth itself - scientists need to hunt for clues to that mysterious distant past. Those clues come in the form of asteroids, comets and other small objects. Like detectives sifting through forensic evide ... read more

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