Despina

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Despina
Despina is the third closest inner satellite of Neptune. It is named after Despoina, a nymph who was a daughter of Poseidon and Demeter. Despina is irregularly shaped and shows no sign of any geological modification. It is likely that it 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. Despina's orbit lies close to but outside of the orbit of Thalassa and just inside the Le Verrier ring. As it is also below Neptune's synchronous orbit radius, it is slowly spiralling inward due to tidal deceleration and may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching. Despina (moon) - Wikipedia, the free encyclopedia
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Short Description Despina is the third closest inner satellite of Neptune. It is named after Despoina, a nymph who was a daughter of Poseidon and Demeter. Despina is irregularly shaped and shows no sign of any geological modification. It is likely that it 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. Despina's orbit lies close to but outside of the orbit of Thalassa and just inside the Le Verrier ring. As it is also below Neptune's synchronous orbit radius, it is slowly spiralling inward due to tidal deceleration and may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching. Despina (moon) - Wikipedia, the free encyclopedia
Discovered by Stephen P. Synnott and Voyager Imaging Team
Discovery date July 1989
Type Moon
AddInfo Neptune V
Satellite of Neptune
Orbit Prograde
Rotation Synchronous
Apoapsis 05 52 537 km
Periapsis 05 52 515 km
Semi-major axis 05 52 526 km
Distance from Sun 02 30.110 387 au /03
Eccentricity 0.000 2
Orbital period 0.334 655 51 day
Orbital speed 02 11.40 km/s
Inclination to the ecliptic 028.56°
Inclination to the equator 000.216
Diameter/Size 03 150 ± 6 km
Dimensions 80×148×128 km
Mass 1018×2.2 kg
Density 01 1.2 g/cm3
Surface gravity  0.026 m/s2
Escape velocity 02 63 m/s
Rotation period 0.334 655 51 day
Axial tilt
Albedo geometric 0.09
Temperature mean 02 51 K | -222 °C
Apparent magnitude 22.0
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