The later Apollo missions Apollo 15 and Apollo 16 to the moon each left a subsatellite behind in lunar orbit to conduct remote scientific measurements of the moon from orbit. The Apollo 15 and Apollo 16 subsatellites were identical.
The subsatellite mission ended with impact of the Apollo 16 subsatellite on the far side of the Moon on May 29. 1972
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- List of Robotic Missions to the moon
 External Links
- Apollo 15 Subsatellite data from National Space Science Data Center (NSSDC)
- Apollo 15 Subsatellite information from the Lunar and Planetary Institute (LPI)
- Apollo 16 Subsatellite information from LPI
- Lunar Particle Shadows and Boundary Layer (subsatellite experiment results) from NSSDC
- Apollo 15 Orbital Science page from LPI
- Apollo 16 Orbital Science page from LPI
- Lunar subsatellite PFS-1 at wikipedia
- Lunar subsatellite PFS-2 at wikipedia