- Additional Information
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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 0° Albedo geometric 0.09 Temperature mean 02 51 K Apparent magnitude 23.3 - Comments
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