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Definition of Satellite planet
1. Noun. (archaic) (astronomy) A moon of a planet besides Earth; a secondary planet. ¹
2. Noun. (astronomy) A planet viewed as a satellite of another object, such as another star; an exoplanet. ¹
3. Noun. (astronomy) A moon of planetary mass; a natural satellite which would be considered a dwarf planet if it were in direct orbit of the Sun. ¹
¹ Source: wiktionary.com