satellite planet

名词noun

1. 1(astronomy) A planet viewed as a satellite of another object, such as another star; an exoplanet.
2. 2(astronomy) 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.
3. 3(archaic, astronomy) A moon of a planet besides Earth; a secondary planet; a natural planetary satellite.