Adrastea (moon)

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Adrastea

Image of Adrastea taken by Galileo's solid state imaging system between November 1996 and June 1997.

Discovery
Discovered by David C. Jewitt
G. Edward Danielson
Discovered on July 8, 1979
Orbital characteristics
Mean radius 128,694 km (0.000860 AU)
Eccentricity 0.0018
Periapsis 128,460 km (0.000859 AU)
Apoapsis 128,930 km (0.000862 AU)
Revolution period 0.29826 d (7 h 9.5 min)
Orbital circumference 808,600 km (0.005 AU)
Orbital velocity max: 31.435 km/s
mean: 31.378 km/s
min: 31.322 km/s
Inclination 2.22° (to the ecliptic)
0.00° (to Jupiter's equator)
Is a satellite of Jupiter
Physical characteristics
Mean diameter 20 km (26×20×16 km)
Surface area ~5300 km²
Volume ~4400 km³
Mass kg
Mean density 3.0 g/cm³
Surface gravity ~0.005 m/s² (0.001 g)
Escape velocity ~0.011 km/s
Rotation period synchronous
Rotation velocity 11 km/h
Axial tilt zero
Albedo 0.10
Surface temp.
min mean max
K ~122 K K

Atmospheric pressure 0 kPa
Adrastea (ad'-rə-stee'-ə, IPA: [ˌædrəˈstiə], Greek Αδράστεια), or Jupiter XV, is the second of Jupiter's known moons (counting outward from the planet). It was discovered on Voyager 2 probe photographs taken in 1979 and received the designation S/1979 J 1 ([IAUC 3454]) after the discovery had been announced in Science (vol. 206, p. 951, November 23, 1979). In 1983 it was officially named after the mythological Adrastea, daughter of Jupiter and Ananke.

It is the smallest of the inner satellites of Jupiter.

Adrastea is the first natural satellite to be discovered through the use of images taken by an interplanetary spacecraft, rather than through telescopic photography.

Adrastea 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.

... | Metis | Adrastea | Amalthea | ...

[http://encycl.opentopia.com/ edit ] Jupiter (satellites)
Inner satellites \| Galilean moons \| Themisto \| Himalia group \| Carpo
S/2003 J 12 \| Ananke group \| Carme group \| Pasiphaë group \| S/2003 J 2
See also: \| Rings of Jupiter

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