Adrastea ("a DRAS tee uh") is the second of
Jupiter's known
moons. It was discovered by the [Voyager 1]
? probe and is named after the daughter of Jupiter and
Ananke. It is inside Jupiter's
planetary ring and may be the source of some of its material. Its orbit lies inside Jupiter's synchronous orbit radius, and as a result tidal forces are slowly causing its orbit to decay. It is also within Jupiter's [Roche limit]
?, but is small enough to avoid tidal disruption.
- Orbital radius: 129,000 km
- Diameter: 20 km (23 x 20 x 15)
- Mass: 1.91*1016kg
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