Thalassa

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Thalassa
Thalassa is the second innermost satellite of Neptune. Thalassa was named after sea goddess Thalassa, a daughter of Aether and Hemera from Greek mythology. "Thalassa" is also the Greek word for "sea". Thalassa is irregularly shaped and shows no sign of any geological modification. Since the Thalassian orbit is 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.
Additional Information

Additional Information

Short Description Thalassa is the second innermost satellite of Neptune. Thalassa was named after sea goddess Thalassa, a daughter of Aether and Hemera from Greek mythology. "Thalassa" is also the Greek word for "sea". Thalassa is irregularly shaped and shows no sign of any geological modification. Since the Thalassian orbit is 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.
Discovered by Richard John Terrile and Voyager Imaging Team
Discovery date September 1989
Type Moon
AddInfo Neptune IV
Satellite of Neptune
Orbit Prograde
Rotation Synchronous
Apoapsis 05 50 085 km
Periapsis 05 50 065 km
Semi-major axis 05 50 075 km
Distance from Sun 02 30.110 387 au /02
Eccentricity 0.000 2
Orbital period 0.311 484 44 day
Orbital speed 02 11.71 km/s
Inclination to the ecliptic 028.40°
Inclination to the equator 000.21°
Diameter/Size  82 ± 6 km
Dimensions 108×100×52 km
Mass 1017×3.5 kg
Density 01 1.2 g/cm3
Surface gravity  0.015 m/s2
Escape velocity 02 35 m/s
Axial tilt
Albedo geometric 0.09
Temperature mean 02 51 K
Apparent magnitude 23.3
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