The second-closest satellite of Jupiter, distance 128 980 km, orbital period 0.298 days; also known as Jupiter XV. Adrastea is 20 × 16 × 14 km in size. It was discovered in 1979 with the Voyager 2 spacecraft. It lies less than one Jovian radius above the planet's cloud tops and just within the outer rim of Jupiter's main ring. Material knocked off Adrastea by micrometeorite impacts is thought to contribute to the ring.
Subjects: Earth Sciences and Geography — Astronomy and Astrophysics.