satellite planet

Noun

satellite planet (plural satellite planets)

1. A planet viewed as a satellite of another object, such as another star; an exoplanet.
   • It is possible that supernovae occur in conjunction with either a satellite planet or binary star.1970 January 17, Stirling Colgate, “Ejection of Companion Objects by Supernovae”, in Nature, volume 225, Letters, pages 247–248
2. A moon of planetary mass; a natural satellite which would be considered a planet or dwarf planet if it were in direct orbit of the Sun.
   • it's only been in recent years that astronomers and planetary scientists have been willing to think of planets, like they've long thought of stars and galaxies, as capable of orbiting one another. And of course those objects are the satellite planets.ca. 2009, Challenger Center, “Satellite Planets with Dr. Alan Stern”, in (Please provide the book title or journal name)
3. (archaic) A moon of a planet besides Earth; a secondary planet; a natural planetary satellite.
   • The Motions of the ſix Primary Planets round the Sun is So adjuſted, that the Square of the Times of their peroidical [sic] Revolutions are as the Cubes of their Diſtances from the Sun : And the ſame thing is found by all Aſtronomers to be true, with Regard to the Motions of the Secondary Planets...1723, John Harris, “Planets”, in Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences