DOE - Office of Nuclear Energy

Power Source	Spacecraft	Mission Type	Launch Date
ALRH	Apollo 11	Lunar Surface	14-Jul-69
Status: Radioisotope heater units for seismic experimental package. Station was shut down August 3, 1969..
SNAP-3B7	Transit 4A	Navigational	29-Jun-61
Status: RTG operated for 15 years. Satellite now shut down but operational.
SNAP-3B8	Transit 4B	Navigational	15-Nov-61
Status: RTG operated for 9 years. Satellite operated periodically after 1962 high altitude test. Last reported signal in 1971.
SNAP-9A	Transit 5-BN-1	Navigational	28-Sept-63
Status: RTG operated as planned. Non-RTG electrical problems on satellite caused satellite to fall after 9 months.
SNAP-9A	Transit 5-BN-2	Navigational	5-Dec-63
Status: RTG operated for over 6 years. Satellite lost ability to navigate after 1.5 years.
SNAP-9A	Transit 5-BN-3	Navigational	21-Apr-64
Status: Mission was aborted because of launch vehicle failure. RTG burned up on re-entry as designed.
SNAP-19	Pioneer 10	Planetary	2-Mar-72
Status: RTGs still operating. Spacecraft successfully operated to Jupiter and is now beyond orbit of Pluto.
SNAP-19	Pioneer 11	Planetary	5-Apr-73
RTGs still operating. Spacecraft successfully operated to Jupiter, Saturn, and beyond.
SNAP-19	Viking 1	Mars surface	20-Aug-75
Status: RTGs operated for over 6 years until lander was shut down.
SNAP-19	Viking 2	Mars surface	9-Sept-75
Status: RTGs operated for over 4 years until relay link was lost.
SNAP-19B2	Nimbus-B-1	Meteorological	18-May-68
Status: Mission was aborted because of range safety destruct. RTG heat sources recovered and recycled.
SNAP-19B3	Nimbus III	Meteorological	14-Apr-69
Status: RTGs operated for over 2.5 years.
SNAP-27	Apollo 13	Lunar surface	11-Apr-70
Status: Mission aborted on the way to the moon. RTG re-entered earth's atmosphere and landed in South Pacific Ocean. No radiation was released.
SNAP-27	Apollo 15	Lunar surface	26-Jul-71
Status: RTG operated for over 6 years until station was shut down.
SNAP-27	Apollo 16	Lunar surface	16-Apr-72
Status: RTG operated for about 5.5 years until station was shut down.
SNAP-27	Apollo 17	Lunar surface	7-Dec-72
Status: RTG operated for almost 5 years until station was shut down.
SNAP-27	Apollo 12	Lunar surface	14-Nov-69
Status: RTG operated for about 8 years until station was shut down.
SNAP-27	Apollo 14	Lunar surface	31-Jan-71
Status: RTG operated for over 6.5years until station was shut down.
SNAP-27	Apollo 17	Lunar surface	7-Dec-72
Status: RTG operated for almost 5 years until station was shut down.
Transit-RTG	“Transit” (Triad-01-1X)	Navigational	2-Sept-72
Status: RTG still operating.
MHW-RTG	LES 8*	Communications	14-Mar-76
Status: RTGs still operating.
MHW-RTG	LES 9*	Communications	14-Mar-76
Status: RTGs still operating.
MHW-RTG	Voyager 2	Planetary	20-Aug-77
RTGs still operating. Spacecraft successfully operated to Jupiter, Saturn, Uranus, Neptune, and beyond.
MHW-RTG	Voyager 1	Planetary	5-Sept-77
RTGs still operating. Spacecraft successfully operated to Jupiter, Saturn, and beyond.
GPHS-RTG	Galileo	Planetary	18-Oct-89
Status: Spacecraft destroyed after completion of mission.
GPHS-RTG	Ulysses	Planetary/Solar	6-Oct-90
Status: RTG still operating.
GPHS-RTG	Cassini	Planetary	15-Oct-97
Status: RTGs still operating. Spacecraft obtaining information at Saturn.
GPHS-RTG	New Horizons	Planetary	19-Jan-06
Status: RTG still operating. Spacecraft en route to Pluto.

Program Links

Space Program Overview
------------------------------- Space Program History
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Missions
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Radioisotope Power
Systems (RPS)
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Radioisotope Heater
Units (RHUs)
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General Purpose Heat Source (GPHS)
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Fuel

Program documents

Program Fact Sheet
--------------------------------
Space Radioisotope Power Systems: Multi-Mission Radioisotope Thermoelectric Generator
-------------------------------- Space Radioisotope Power Systems: New Horizon
Missions (Pluto)
-------------------------------- Space Radioisotope Power Systems: Safety
-------------------------------- Space Radioisotope Power Systems: Stirling Radioisotope Generator