Science Fair Project Encyclopedia
Ananke (moon)
| Discovery | |||||||
|---|---|---|---|---|---|---|---|
| Discovered by | S. B. Nicholson | ||||||
| Discovered in | 1951 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 21,048,000 km | ||||||
| Eccentricity | 0.083-0.452 | ||||||
| Orbital period | ~629d | ||||||
| Inclination | 122.2-172.9° | ||||||
| Is a satellite of | Jupiter | ||||||
| Physical characteristics | |||||||
| Mean diameter | 30 km | ||||||
| Surface area | km2 | ||||||
| Mass | 3.82×1016 kg | ||||||
| Mean density | 2.7 g/cm3 | ||||||
| Surface gravity | 0.010 m/s2 | ||||||
| Rotation period | ? | ||||||
| Axial tilt | ?° | ||||||
| Albedo | 0.04 | ||||||
| Surface temp. |
| ||||||
| Atmospheric pressure | 0 kPa | ||||||
Ananke (a-nang'-kee, IPA ; Greek Ανάγκη) is one of Jupiter's moons. It was discovered by Seth Barnes Nicholson at Mount Wilson Observatory in 1951 and is named after the mythological Ananke, the mother of Adrastea by Jupiter.
Ananke did not receive its present name until 1975; before then, it was simply known as Jupiter XII. It was sometimes called "Adrastea". Note that Adrastea is now the name of another satellite of Jupiter.
It gives its name to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.
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Last updated: 07-16-2005 21:36:46
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details