Larissa (moon)
Moon of Neptune / From Wikipedia, the free encyclopedia
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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).
Quick Facts Discovery, Discovered by ...
Discovery | |
---|---|
Discovered by | Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky, and David J. Tholen[1] |
Discovery date | May 24, 1981 |
Designations | |
Designation | Neptune VII |
Pronunciation | /ləˈrɪsə/[2] |
Named after | Λάρισσα Lārissa |
S/1989 N 2 S/1981 N 1 | |
Adjectives | Larissean,[3] Larissan,[4] Larissian[5] /ləˈrɪs(i)ən/ |
Orbital characteristics[6][7] | |
Epoch 18 August 1989 | |
73 548.26 km | |
Eccentricity | 0.001393 ± 0.00008 |
0.55465332 ± 0.00000001 d | |
Inclination |
|
Satellite of | Neptune |
Physical characteristics | |
Dimensions | (216±6) × (204±16) × (168±4) km[8] |
Mean radius | 97±3 km[8] |
118236.98 km2[9] | |
Volume | ~3.64×106 km3[lower-alpha 1] |
Mass | ~(0.19–5.7)×1018 kg[lower-alpha 2] |
Mean density | ~0.052–1.57 g/cm3[lower-alpha 3] |
~0.001–0.054 m/s2[lower-alpha 4] | |
~0.015–0.095 km/s[lower-alpha 5] | |
synchronous | |
zero | |
Albedo | 0.09[8][13] |
Temperature | ~51 K mean (estimate) |
21.5[13] |
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Larissa is also the eponymous nymph of the city in Thessaly, Greece.