
Subsatellite is a satellite (artificial or natural) that orbits a natural satellite, i.e. a `moon of a moon`. There are no known natural subsatellites in the Solar System. In most cases, the tidal effects of the primary would make such a system unstable. == Rhea == The possible detection of a ring system around Saturn`s natural satellite Rhea l......
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http://en.wikipedia.org/wiki/Subsatellite

A portion of a satellite that has a mission objective of its own. Once in space, the subsatellite is ejected and assumes its own orbit.
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http://www.daviddarling.info/encyclopedia/S/subsatellite.html

a satellite designed to be released into orbit from another spacecraft.
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https://www.infoplease.com/dictionary/subsatellite
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