Himalia (moon)
Himalia as seen by Cassini–Huygens
|
|
| Discovery | |
|---|---|
| Discovered by | C. D. Perrine |
| Discovery date | December 3, 1904 |
| Designations | |
| Adjectives | Himalian |
| Orbital characteristics | |
| Periapsis | 9,782,900 km |
| Apoapsis | 13,082,000 km |
|
Mean orbit radius
|
11,460,000 km |
| Eccentricity | 0.16 |
| 250.56 d (0.704 a) | |
|
Average orbital speed
|
3.312 km/s |
| Inclination |
|
| Satellite of | Jupiter |
| Physical characteristics | |
|
Mean radius
|
75±10 × 60±10 km (Cassini estimate) 85 ± ?? km (ground-based estimate) |
| ~90,800 km2 | |
| Volume | ~2,570,000 km3 |
| Mass | 6.7×1018kg 4.19×1018 kg |
|
Mean density
|
2.6 g/cm3 (assumed) 1.63 g/cm3 (assuming radius 85 km) |
| ~0.062 m/s2 (0.006 g) | |
| ~0.100 km/s | |
|
Sidereal rotation period
|
7.782 h |
| Albedo | 0.04 |
| Temperature | ~124 K |
| 14.6 | |
Himalia (/haɪˈmeɪliə/ hy-MAY-lee-ə or /hɪˈmɑːliə/ hi-MAH-lee-ə; Greek: ‘Ιμαλíα) is the largest irregular satellite of Jupiter, the sixth largest overall in size, and only the four Galilean moons of Jupiter have greater mass. It was discovered by Charles Dillon Perrine at the Lick Observatory on 3 December 1904 and is named after the nymph Himalia, who bore three sons of Zeus (the Greek equivalent of Jupiter). It is one of the largest planetary moons in the Solar System not imaged in detail, and the largest not including the moons of Neptune and several trans-Neptunian objects, particularly that of the second-largest-but-most-massive dwarf planet, Eris.
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