# Thalassa, Moon of Neptune

**Thalassa** is a Moon that orbits round Neptune rather than the Sun which our Earth orbits round. Its orbit circumference, the total distance it travels round its planetary parent is 314,624.22 km. The furthest it gets from its orbital parent (apoasis) is 50,084 km. Its mass is estimated/calculated at being 374,667,108,274,298,000 kg. Its density has been calculated at being 1.3 g/cm3. Its volume is 1.3 g/cm3. It was discovered in the year 1989 by R. Terrile, Voyager 2.

The Semi-Major Axis of the orbit is 50,074 km, which is the furthest point from the centre to the edge of an elliptical point.

The mass of the object is calculated at being 374,667,108,274,298,000 kg. The equatorial circumference of Thalassa is 257.6 km. The mean radius of Thalassa is 41.0 km. The surface area of Thalassa is 21,124.07 km2. The surface gravity of the said item is 0.015 m/s2. The average orbit velocity, that is the speed at which it orbits is 42,152.2 km/h.

The orbital inclination, the angle at which Thalassa orbits in relation to the orbital plane is 0.135 degrees. The orbital eccentricity is 0.0002, it is the degree at which Thalassa orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Thalassa Facts

Type | Moon |

Orbital Circumference | 314,624.22 km |

Furthest from parent (Apoasis) | 50,084 km |

Mass | 374,667,108,274,298,000 kg |

Density | 1.3 g/cm3 |

Volume | 288,696 km3 |

Year of Discovery | 1989 |

Discoverer | R. Terrile, Voyager 2 |

Semi-Major Axis | 50,074 km |

Mass | 374,667,108,274,298,000 kg |

Equatorial Circumference | 257.6 km |

Mean Radius | 41.0 km |

Surface Area | 21,124.07 km2 |

Surface Gravity | 0.015 m/s2 |

Average Orbit Velocity | 42,152.2 km/h |

Orbital Inclination | 0.135 |

Orbital Eccentricity | 0.0002 |

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