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NASA Tracks Navigation Errors, Fuel Shortage in DART Rendezvous Mission

NASA Tracks Navigation Errors, Fuel Shortage in DART Rendezvous Mission
An Orbital Sciences-built Pegasus XL rocket successfully orbited NASA's autonomous DART spacecraft on April 15,2004 during an air-launch staged from a Stargazer L-1011 carrier aircraft flying over the Pacific Ocean. (Image credit: NASA TV.)

DART, an$110 million experimental space mission designed to test automated dockingtechnology, ended prematurely late Friday after its launch from Vandenberg AirForce Base in California, NASA said today.

NASA's DART (Demonstration of Automated Rendezvous Technology) was launchedFriday at 1:25 p.m. EDT from a Pegasus rocket, which was released from aStargazer L-1011 aircraft at 40,000 feet over the Pacific Ocean.

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During the subsequent rendezvous phase, "everything was working wonderful," hesaid. "We had high accuracy."

In orbit, DART was to fly around the Earth and rendezvous with an experimentalcommunications satellite launched in 1999. It was to get about 16 feet from thesatellite and perform several up-close maneuvers using a guidance sensor aboardDART and Global Positioning System satellite navigation information.

The 800-pound DART successfully met up with its target satellite and approachedwithin about 300 feet, but managers noticed it was using fuel too fast.

The guidance system sensed the empty fuel tank and commanded the spacecraft toretreat and enter the safe orbit that should lead it to burn up in theatmosphere within 10 years, Snoddy said.

DART was executing an engine burn that would put it in that orbit today.

Snoddy wouldn't speculate why the craft lost fuel soquickly -- it started with enough to do all its maneuvers twice, plus a 30percent margin -- but said managers had not seen evidence of a leak.

NASA is forming a mishap investigation board to look into the failure.

Snoddy said some of DART'stechnology was proven in the aborted mission, but not the critical maneuversthat would demonstrate the ability of a spacecraft to dock without humanintervention.

"We've done what nobody's ever tried to do before," Snoddysaid of DART, which was "high risk" in that, to save money, it had limitedability to communicate or fix problems on the fly during its planned 24-hourmission.

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