Metis, named after the aformentioned Titan mate of Zeus, is the innermost known moon of the planet Jupiter. It was discovered in 1979 by Stephen Synnott. Along with Adrastea, it lies in Jupiter's main ring and is the likely source of that ring's material. Most of the little information known about Metis was taken from the Voyager space probe.
Data:
Mass: 9.56*10^6 kg
Equatorial radius: 20 km
Orbital period: 0.294779 days
Rotational period: unknown
Mean distance from planet: 128,000 km
Mean density: 2.8 g/cm3
Mean orbital velocity: 31.57 km/s
Escape velocity: 0.0253 km/s