satellite planet

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 or Satellites round their primary ones. … But if the Orbit of the Satellite Planet, inſtead of being a Circle be an Ellipſis, in whoſe Focus the Primary Planet is ſuppoſed to be placed, then will the greater Axis of this Elliptical Orbit, twice advance forward, viz. in the 2 Quadratures, and twice recede backward, viz. in the 2 Syzygies, of every Revolution of the Satellite round the Planet.

It is possible that supernovae occur in conjunction with either a satellite planet or binary star.

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.