Sponsored by the Institute of Physics   Planets   Mercury   Venus   Earth   Mars   Jupiter   Saturn   Uranus   Neptune     Rings     Naiad     Thalassa     Despina     Galatea     Larissa     Proteus     Triton     Nereid   Pluto Asteroids Comets Constellations Sunrise and Sunset Times Moon Phases SI Units Symbols   Printer Version Astronomy Planets - Neptune - Thalassa Bulk Parameters Orbital Parameters Bulk Parameters Mass Radius 40 km Mean Density Visual Geometric Albedo 0.06 Orbital Parameters Semimajor Axis 50.075 × 103 km Period 0.311 485 days Orbital Inclination 0.21 ° Orbital Eccentricity 0.0   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Shop | Contact | About   Page compiled: Wed Sep 05 18:38:01 GMT+01:00 2001