Himalia (moon)
Himalia (/hɪˈmeɪliə, hɪˈmɑːliə/), or Jupiter VI, is the largest irregular satellite of Jupiter, with a diameter of at least 140 km (90 mi). It is the sixth largest Jovian satellite, after the four Galilean moons and Amalthea. 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 third largest not imaged in detail within the orbit of Neptune.
Low-resolution image of Himalia from Cassini, December 2000 | |
| Discovery | |
|---|---|
| Discovered by | Charles D. Perrine |
| Discovery site | Lick Observatory |
| Discovery date | 3 December 1904 |
| Designations | |
Designation | Jupiter VI |
| Pronunciation | /hɪˈmeɪliə/ or /hɪˈmɑːliə/ |
Named after | Ἱμαλία Himalia |
| Adjectives | Himalian |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Observation arc | 114.25 yr (41,728 days) |
Semi-major axis | 0.0761287 AU (11,388,690 km) |
| Eccentricity | 0.1537860 |
Orbital period (sidereal) | +248.29 d |
Mean anomaly | 94.30785° |
Mean motion | 1° 26m 59.616s / day |
| Inclination | 29.90917° (to the ecliptic) |
Longitude of ascending node | 44.99935° |
| 21.60643° | |
| Satellite of | Jupiter |
| Group | Himalia group |
| Physical characteristics | |
| Dimensions | 205.6 × 141.3 km (occultation, projected) 150±20 × 120±20 km (Cassini estimate) |
Mean diameter | 139.6±1.7 km |
| Mass | (4.2±0.6)×1018 kg |
Mean density | 1.63 g/cm3 (assuming radius 85 km) |
Surface gravity | ~ 0.062 m/s2 (0.006 g) |
| ~ 0.100 km/s | |
Synodic rotation period | 7.7819±0.0005 h |
| Albedo | 0.057±0.008 |
Spectral type | C |
| 14.6 | |
| 7.9 | |
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