Thalassa
Satellite
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Thalassa, also known as Neptune IV, 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". Wikipedia
Gravity: 0.015 m/s²
Discovered: September 1989
Radius: 25.476 mi
Discoverer: Richard J. Terrile
Mean density: 1.23±0.43 g/cm3
Shape: roughly disk-shaped
Apparent magnitude: 23.32