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Adrastea (moon)

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Adrastea
Image:adrastea.jpg
This image of Adrastea was 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
Periastron 128,460 km (0.000859 AU)
Apastron 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 25.51 (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 7.5×1015 kg
Mean density 3.0 g/cm3
Surface gravity 0.0066 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'-ra-stee'-a, Greek Αδράστεια) 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 (http://cfa-www.harvard.edu/iauc/03400/03454.html)) 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 also known as Jupiter XV.

It is the smallest of the Amalthea group of small inner jovian moons.

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.

Missing image
Adraste_FDS_20630.png
Discovery image of Adrastea, taken on July 8, 1979 by Voyager 2. Adrastea is the dot in the very middle, straddling the line of the Jovian rings.


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


Jupiter's natural satellites

edit  (http://clipart.academickids.com/encyclopedia/index.php?title=Template:Jupiter_Footer&action=edit)

Metis | Adrastea | Amalthea | Thebe | Io | Europa | Ganymede | Callisto | Themisto | Leda | Himalia | Lysithea | Elara | S/2000 J 11 | Carpo | S/2003 J 12 | Euporie | S/2003 J 3 | S/2003 J 18 | Thelxinoe | Euanthe | Helike | Orthosie | Iocaste | S/2003 J 16 | Ananke | Praxidike | Harpalyke | Hermippe | Thyone | Mneme | S/2003 J 17 | Aitne | Kale | Taygete | S/2003 J 19 | Chaldene | S/2003 J 15 | S/2003 J 10 | S/2003 J 23 | Erinome | Aoede | Kallichore | Kalyke | Eurydome | S/2003 J 14 | Pasithee | Cyllene | Eukelade | S/2003 J 4 | Hegemone | Arche | Carme | Isonoe | S/2003 J 9 | S/2003 J 5 | Pasipha | Sinope | Sponde | Autonoe | Callirrhoe | Megaclite | S/2003 J 2
Amalthea group | Galilean moons | Himalia group | Ananke group | Carme group | Pasipha group
de:Adrastea (Mond)

es:Adrastea (luna) fr:Adraste (lune) it:Adrastea (astronomia) nl:Adrastea (maan) nn:Jupitermnen Adrastea ja:アドラステア pl:Adrastea (księżyc) pt:Adrastea sr:Адрастеа sk:Adrastea (mesiac) sv:Adrastea zh:木卫十五

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