What is Quasi-satellite?
[[File:Quasi-satellite_diagram.svg|thumb|right|Diagram of a quasi-satellite's orbit]] A '''quasi-satellite''' is an [[astronomical object]] that crosses a [[Planet|planet's]] [[orbit]] during its own orbit. A quasi-satellite's orbit around the [[Sun]] takes exactly the same time as the planet's orbit. Its [[eccentricity]] is different from the eccentricity of the planet. The orbits of quasi-satellites are unstable and over time they will break free from the planet's [[gravity]]. {{-}} {{Science-stub}} [[Category:Astronomical objects]]