Two views of Larissa by Voyager 2
|Discovered by||Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky, and David J. Tholen|
|Discovered on||May 24, 1981|
|Epoch 18 August 1989|
|Semi-major axis||73 548 ± 1 km|
|Eccentricity||0.001393 ± 0.00008|
|Orbital period||0.55465332 ± 0.00000001 d|
|Inclination||0.251 ± 0.009° (to Neptune equator)|
0.205° (to local Laplace plane)
|Is a moon of||Neptune|
|Dimensions||216×204×164 km (± ~10 km)|
|Mass||~4.2×1018 kg (estimate)|
|Mean density||~1.2 g/cm3 (estimate)|
|Rotation period||assumed synchronous|
|Axial tilt||~zero presumably|
|Surface temp.||~51 K mean (estimate)|
Larissa or Neptune VII, is the fifth closest moon to Neptune. It is named after Larissa, a lover of Poseidon (Neptune) in Greek mythology.
It was first found by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen based on ground-based stellar occultation observations on May 24, 1981, and given the designation S/1981 N 1 and said on 29 May 1981. The moon was refound and confirmed to be the only object in its orbit during the Voyager 2 flyby in 1989 after which it received another designation S/1989 N 2 on August 2, 1989.
Larissa is not a sphere and appears to be cratered a lot, with no sign of any geological changes. Little else is known about it.
Other websites[change | change source]
- Larissa Profile Archived 2007-08-01 at the Wayback Machine by NASA's Solar System Exploration