# Themisto, Moon of Jupiter

**Themisto** is a Moon that orbits round the planet Jupiter. Its orbit circumference, the total distance it travels round its planetary parent is 46,467,175.95 km. The furthest it gets from its orbital parent (apoasis) is 9,326,697 km. Its mass is estimated/calculated at being 689,387,479,224,709 kg. Its density has been calculated at being 2.6 g/cm3. Its volume is 268 km3.

Themisto was discovered on 30 September 1975 by First time: Charles Thomas Kowal and Elizabeth Roemer. Its orbital period, i.e. the period it takes to complete an orbit round Jupiter is 130.02 days. The figure is also known as the sidereel period. The figure comes from N.A.S.A..

The Semi-Major Axis of the orbit is 7,507,000 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 689,387,479,224,709 kg. The equatorial circumference of Themisto is 25.1 km. The mean radius of Themisto is 4.0 (assuming an albedo of 0.04) km. The surface area of Themisto is 201.06 km2. The surface gravity of the said item is 0.003 m/s2. The average orbit velocity, that is the speed at which it orbits is 14,891.0 km/h.

The orbital inclination, the angle at which Themisto orbits in relation to the orbital plane is 43.068 degrees. The orbital eccentricity is 0.2424, it is the degree at which Themisto orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Themisto Facts

Type | Moon |

Orbital Circumference | 46,467,175.95 km |

Furthest from parent (Apoasis) | 9,326,697 km |

Mass | 689,387,479,224,709 kg |

Density | 2.6 g/cm3 |

Volume | 268 km3 |

Date of Discovery | 30 September 1975 |

Discoverer | First time: Charles Thomas Kowal and Elizabeth Roemer |

Orbital Period | 130.02 |

Semi-Major Axis | 7,507,000 km |

Mass | 689,387,479,224,709 kg |

Equatorial Circumference | 25.1 km |

Mean Radius | 4.0 (assuming an albedo of 0.04) km |

Surface Area | 201.06 km2 |

Surface Gravity | 0.003 m/s2 |

Average Orbit Velocity | 14,891.0 km/h |

Orbital Inclination | 43.068 |

Orbital Eccentricity | 0.2424 |

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