Larissa

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Larissa
Larissa is the fifth-closest inner satellite of Neptune. It is named after Larissa, a lover of Poseidon (Neptune) in Greek mythology and eponymous nymph of the city in Thessaly, Greece. The fourth-largest satellite of Neptune, Larissa is irregular (non-spherical) in shape and appears to be heavily cratered, with no sign of any geological modification. Little else is known about it. It is likely that Larissa, like the other satellites inward of Triton, is a rubble pile re-accreted from fragments of Neptune's original satellites, which were smashed up by perturbations from Triton soon after that moon's capture into a very eccentric initial orbit. Larissa (moon) - Wikipedia, the free encyclopedia
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Short Description Larissa is the fifth-closest inner satellite of Neptune. It is named after Larissa, a lover of Poseidon (Neptune) in Greek mythology and eponymous nymph of the city in Thessaly, Greece. The fourth-largest satellite of Neptune, Larissa is irregular (non-spherical) in shape and appears to be heavily cratered, with no sign of any geological modification. Little else is known about it. It is likely that Larissa, like the other satellites inward of Triton, is a rubble pile re-accreted from fragments of Neptune's original satellites, which were smashed up by perturbations from Triton soon after that moon's capture into a very eccentric initial orbit. Larissa (moon) - Wikipedia, the free encyclopedia
Discovered by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen
Discovery date May 24, 1981
Type Moon
AddInfo Neptune VII
Satellite of Neptune
Orbit Prograde
Rotation Synchronous
Apoapsis 05 73 650 km
Periapsis 05 73 445 km
Semi-major axis 05 73 548 km
Distance from Sun 02 30.110 387 au /05
Eccentricity 0.001 393
Orbital period 0.554 653 32 day
Orbital speed 01 9.63 km/s
Inclination to the ecliptic 028.63°
Inclination to the equator 000.251
Diameter/Size 03 194 ± 6 km
Dimensions 216×204×168 km (± ~10 km)
Mass 1018×4.2 kg
Density 01 1.2 g/cm3
Surface gravity  0.03 m/s2
Escape velocity 02 76 m/s
Rotation period 0.554 653 32 day
Axial tilt
Albedo geometric 0.09
Temperature mean 02 51 K | -222 °C
Apparent magnitude 21.5
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