Solar System Objects: Earth (Planet) - Period: 365.3 days Orbital velocity: 89.35 km/s Mars (Planet) - Period: 687.0 days Orbital velocity: 63.34 km/s Luna (Moon of Earth) - Period: 27.3 days Orbital velocity: 119.55 km/s Phobos (Moon of Mars) - Period: 0.3 days Orbital velocity: 13599.02 km/s Ceres (Asteroid (rocky)) - Period: 1683.0 days Orbital velocity: 17.45 km/s Vesta (Asteroid (metallic)) - Period: 1325.0 days Orbital velocity: 22.17 km/s Moons only: Luna Phobos