Naiad

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Naiad
Naiad is the innermost satellite of Neptune, named after the Naiads of Greek legend. Naiad is irregularly shaped and probably has not been modified by any internal geological processes since its formation. 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. Naiad orbits about 23,500 km above Neptune's cloud tops. Since this is below the synchronous orbit radius, its orbit is slowly decaying due to tidal deceleration and it may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching. Naiad (moon) - Wikipedia, the free encyclopedia
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Short Description Naiad is the innermost satellite of Neptune, named after the Naiads of Greek legend. Naiad is irregularly shaped and probably has not been modified by any internal geological processes since its formation. 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. Naiad orbits about 23,500 km above Neptune's cloud tops. Since this is below the synchronous orbit radius, its orbit is slowly decaying due to tidal deceleration and it may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching. Naiad (moon) - Wikipedia, the free encyclopedia
Discovered by Voyager Imaging Team
Discovery date September 1989
Type Moon
AddInfo Neptune III
Satellite of Neptune
Orbit Prograde
Rotation Synchronous
Apoapsis 05 48 246 km
Periapsis 05 48 208 km
Semi-major axis 05 48 227 km
Distance from Sun 02 30.110 387 au /01
Eccentricity 0.000 4
Orbital period 0.294 395 8 day
Orbital speed 02 11.93 km/s
Inclination to the ecliptic 033,15°
Inclination to the equator 004.75
Diameter/Size 02 66 ± 6 km
Dimensions 96×60×52 km
Mass 1017×1.9 kg
Density 01 1.3 g/cm3
Surface gravity  0.012 m/s2
Escape velocity 02 28 m/s
Rotation period 0.294 395 8 day
Axial tilt
Albedo geometric 0.07
Temperature mean 02 51 K
Apparent magnitude 23.9
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