Ananke (moon)
|
|
| Discovery | |||||||
|---|---|---|---|---|---|---|---|
| Discovered by | S. B. Nicholson | ||||||
| Discovered on | September 28, 1951 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 20,815,230 km (0.13914 AU) | ||||||
| Eccentricity | 0.3963 | ||||||
| Periastron | 12,567,000 km (0.084 AU) | ||||||
| Apastron | 29,063,500 km (0.194 AU) | ||||||
| Orbital period | 613.518491 d (1.680 a) | ||||||
| Orbital circumference | 125,489,900 km (0.839 AU) | ||||||
| Orbital velocity | max: 3.752 km/s mean: 2.367 km/s min: 1.622 km/s | ||||||
| Inclination | 162.109° (to the ecliptic) 149.526° (to Jupiter's equator) | ||||||
| Is a satellite of | Jupiter | ||||||
| Physical characteristics | |||||||
| Mean diameter | 28 km | ||||||
| Surface area | ~2500 km2 | ||||||
| Volume | ~11,500 km3 | ||||||
| Mass | 3.0×1016 kg | ||||||
| Mean density | 2.6 g/cm3 | ||||||
| Surface gravity | 0.010 m/s2 (0.001 g) | ||||||
| Escape velocity | ~0.017 km/s | ||||||
| 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°.
External links
- Nicholson, S.B., "An unidentified object near Jupiter, probably a new satellite", PASP 63 (1951) 297–299 (http://adsabs.harvard.edu//full/seri/PASP./0063//0000297.000.html)
| Jupiter's natural satellites edit (https://academickids.com:443/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 | Pasiphaë | Sinope | Sponde | Autonoe | Callirrhoe | Megaclite | S/2003 J 2 |
| Amalthea group | Galilean moons | Himalia group | Ananke group | Carme group | Pasiphaë group |
de:Ananke (Mond) it:Ananke (astronomia) nl:Ananke (maan) sr:Ананке pl:Ananke (księżyc zh:木卫十二