# Halimede, Moon of Neptune

**Halimede** is a Moon that orbits round the planet Neptune. Its orbit circumference, the total distance it travels round its planetary parent is 102,518,463.80 km. The furthest it gets from its orbital parent (apoasis) is 21,006,271 km. Its mass is estimated/calculated at being 89,920,105,985,831,600 kg. Its density has been calculated at being 1.5 g/cm3. Its volume is 124,788 km3.

Halimede was discovered on 14 August 2002 by Matthew J. Holman, John J. Kavelaars, Tommy Grav, Wesley C. Fraser, and Dan Milisavljevic. Its orbital period, i.e. the period it takes to complete an orbit round Neptune is 1879.33 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 16,611,000 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 89,920,105,985,831,600 kg. The equatorial circumference of Halimede is 194.8 km. The mean radius of Halimede is 31.0 (assuming an albedo of 0.04) km. The surface area of Halimede is 12,076.28 km2. The surface gravity of the said item is 0.006 m/s2. The average orbit velocity, that is the speed at which it orbits is 2,273.2 km/h.

The orbital inclination, the angle at which Halimede orbits in relation to the orbital plane is 112.712 degrees. The orbital eccentricity is 0.2646, it is the degree at which Halimede orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Halimede Facts

Type | Moon |

Orbital Circumference | 102,518,463.80 km |

Furthest from parent (Apoasis) | 21,006,271 km |

Mass | 89,920,105,985,831,600 kg |

Density | 1.5 g/cm3 |

Volume | 124,788 km3 |

Date of Discovery | 14 August 2002 |

Discoverer | Matthew J. Holman, John J. Kavelaars, Tommy Grav, Wesley C. Fraser, and Dan Milisavljevic |

Orbital Period | 1879.33 |

Semi-Major Axis | 16,611,000 km |

Mass | 89,920,105,985,831,600 kg |

Equatorial Circumference | 194.8 km |

Mean Radius | 31.0 (assuming an albedo of 0.04) km |

Surface Area | 12,076.28 km2 |

Surface Gravity | 0.006 m/s2 |

Average Orbit Velocity | 2,273.2 km/h |

Orbital Inclination | 112.712 |

Orbital Eccentricity | 0.2646 |