May 19, 1999
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Deep Space 1 Mission Status, 5-19-99
Deep Space 1 began on Monday a test of Remote Agent, a package of onboard software capable of planning and executing many spacecraft activities with only general direction from the ground. For nearly one day following its startup at 11 a.m. PDT Monday, Remote Agent successfully controlled the spacecraft and even resolved a simulated instrument failure.
At 7 a.m. PDT on Tuesday, May 18, however, the experiment team detected an anomaly that interrupted execution of the experiment. The first Indication occurred when Remote Agent did not command the spacecraft's ion propulsion system to shut down as expected. While some portions of the Remote Agent software continued to operate, the component that issues commands had suspended operation.
The spacecraft was determined to be safe and healthy. The experiment software appeared active and was allowed to continue processing while the experiment team and Deep Space 1 flight team analyzed the problem. After retrieving diagnostic data from the spacecraft, a ground command was issued at 4:10 p.m. PDT Tuesday that halted the experiment.
By the time it was halted, the experiment had already achieved approximately 70 percent of its test objectives. A small bug in the very complex software has been identified as the probable cause of the suspension. A follow-up experiment is being considered for Friday, May 21, to complete the remaining objectives for the Remote Agent test.
Further information about the Remote Agent experiment is available in the Deep Space 1 launch press kit and in a May 18 news release, both viewable at
More information can also be found at the Remote Agent web site: http://rax.arc.nasa.gov
See press release from May 17, announcing Remote Agent experiment kickoff.
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