Elara (moon)
| Discovery | |||||||
|---|---|---|---|---|---|---|---|
| Discovered by | C. D. Perrine | ||||||
| Discovered on | January 2, 1905 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 11,683,120 km (0.07810 AU) | ||||||
| Eccentricity | 0.1723 | ||||||
| Periastron | 9,670,500 km (0.065 AU) | ||||||
| Apastron | 13,695,700 km (0.092 AU) | ||||||
| Orbital period | 257.984888 d (0.706 a) | ||||||
| Orbital circumference | 72,859,500 km (0.487 AU) | ||||||
| Orbital velocity | max: 3.919 km/s mean: 3.269 km/s min: 2.767 km/s | ||||||
| Inclination | 30.72° (to the ecliptic) 30.66° (to Jupiter's equator) | ||||||
| Is a satellite of | Jupiter | ||||||
| Physical characteristics | |||||||
| Mean diameter | 86 km | ||||||
| Surface area | ~23,200 km2 | ||||||
| Volume | ~333,000 km3 | ||||||
| Mass | 8.7×1018 kg | ||||||
| Mean density | 2.6 g/cm3 | ||||||
| Surface gravity | 0.031 m/s2 (0.003 g) | ||||||
| Rotation period | ~0.5 d (12 h) | ||||||
| Axial tilt | ?° | ||||||
| Albedo | 0.04 | ||||||
| Surface temp. |
| ||||||
| Atmospheric pressure | 0 kPa | ||||||
Elara (ee-lair'-a or ee'-lur-a, IPA /i:'leərə/ or /'i:lərə/, Greek Ελάρη) is a moon of Jupiter. It was discovered by Charles Dillon Perrine at Lick Observatory in 1905 and is named after the mother by Zeus of the giant Tityus.
Elara did not receive its present name until 1975; before then, it was simply known as Jupiter VII. It was sometimes called "Hera".
It belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.
External links
- Harvard College Observatory Bulletin, 178 (1905) 1
- Publications of the Astronomical Society of the Pacific, 17 (1905) 62
- Astronomische Nachrichten, 169 (1905) 43/44
... | Lysithea | Elara | S/2000 J 11 | ...
| Jupiter's natural satellites |
|---|
| Amalthea group | Galilean moons: Io, Europa, Ganymede, and Callisto | Themisto | Himalia group | Carpo | S/2003 J 12 | Ananke group | Carme group | Pasiphaë group | S/2003 J 2 |
Categories: Jupiter's moons