Larissa (moon)
Larissa, also known as Neptune VII, is the fifth-closest inner satellite of Neptune. It is named after Larissa, a lover of Poseidon (the Greek equivalent of the Roman god Neptune).
Larissa from Voyager 2 | |
| Discovery | |
|---|---|
| Discovered by | Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky, and David J. Tholen |
| Discovery date | May 24, 1981 |
| Designations | |
Designation | Neptune VII |
| Pronunciation | /ləˈrɪsə/ |
Named after | Λάρισσα Lārissa |
Alternative names | S/1989 N 2 S/1981 N 1 |
| Adjectives | Larissean, Larissan, Larissian /ləˈrɪs(i)ən/ |
| Orbital characteristics | |
| Epoch 18 August 1989 | |
Semi-major axis | 73 548.26 km |
| Eccentricity | 0.001393 ± 0.00008 |
Orbital period (sidereal) | 0.55465332 ± 0.00000001 d |
| Inclination |
|
| Satellite of | Neptune |
| Physical characteristics | |
| Dimensions | (216±6) × (204±16) × (168±4) km |
Mean radius | 97±3 km |
Surface area | 118236.98 km2 |
| Volume | ~3.64×106 km3 |
| Mass | ~(0.19–5.7)×1018 kg |
Mean density | ~0.052–1.57 g/cm3 |
Surface gravity | ~0.001–0.054 m/s2 |
| ~0.015–0.095 km/s | |
Synodic rotation period | synchronous |
| zero | |
| Albedo | 0.09 |
| Temperature | ~51 K mean (estimate) |
| 21.5 | |
Larissa is also the eponymous nymph of the city in Thessaly, Greece.
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