Thursday, September 30, 1999 Published at 18:53 GMT 19:53 UK
Confusion leads to Mars failure
The Mars Climate Orbiter: Now in pieces on the planet's surface
The Mars Climate Orbiter Spacecraft was lost because one Nasa team used imperial units while another used metric units for a key spacecraft operation.
"Our inability to recognise and correct this simple error has had major implications," said Dr Edward Stone, director of the Nasa's Jet Propulsion Laboratory (JPL). "We have underway a thorough investigation to understand this issue."
The confusion over units was identified in preliminary findings by JPL's internal peer review. The transfer of information took place between the Mars Climate Orbiter spacecraft team in Colorado and the mission navigation team in California.
"People sometimes make errors," said Dr Edward Weiler, Nasa's Associate Administrator for Space Science. "The problem here was not the error, it was the failure of Nasa's systems engineering, and the checks and balances in our processes to detect the error. That's why we lost the spacecraft."
Focus on future
"Our clear short-term goal is to maximise the likelihood of a successful landing of the Mars Polar Lander on December 3," said Dr Weiler. "The lessons from these reviews will be applied across the board in the future."
Mars Climate Orbiter was one of a series of missions in a long-term program of Mars exploration managed by JPL.