Description
The Deep Space Atomic Clock (DSAC) was a miniaturized, ultra-precise mercury-ion atomic clock for precise radio navigation in deep space. DSAC was designed to be orders of magnitude more stable than existing navigation clocks, with a drift of no more than 1 nanosecond in 10 days.[3] It is expected that a DSAC would incur no more than 1 microsecond of error in 10 years of operations.[4] Data from DSAC is expected to improve the precision of deep space navigation, and enable more efficient use of tracking networks. The project was managed by NASA’s Jet Propulsion Laboratory and it was deployed as part of the U.S. Air Force‘s Space Test Program 2 (STP-2) mission aboard a SpaceX Falcon Heavy rocket on 25 June 2019.[2]
The Deep Space Atomic Clock was activated on 23 August 2019.[5] Following a mission extension in June 2020,[6] DSAC was deactivated on 18 September 2021 after two years in operation.[7]
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