# Phobos, Moon of Mars

**Phobos** is a Moon that orbits round the planet Mars. Its orbit circumference, the total distance it travels round its planetary parent is 58,907.79 km. The furthest it gets from its orbital parent (apoasis) is 9,518 km. Its mass is estimated/calculated at being 10,658,529,896,187,200 kg. Its density has been calculated at being 1.872 g/cm3. Its volume is 5,729 km3.

It was discovered in the year 1877 by A. Hall.

The orbital period, i.e. the period it takes to complete an orbit round Mars is 0.3189 days. The figure is also known as the sidereel period. The figure comes from N.A.S.A.. Its takes 0.3189 Earth days to do a full rotation period.

The Semi-Major Axis of the orbit is 9,376 km, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Phobos is 69.7 km. The mean radius, that is the average radius of Phobos is 11.1 km. The surface area of Phobos is 1,548.30 km2. The surface gravity of the said item is 0.0057 m/s2. The average orbit velocity, that is the speed at which it orbits is 7696.7 km/h.

The orbital inclination, the angle at which Phobos orbits in relation to the orbital plane is 1.075 degrees. The orbital eccentricity is 0.0151, it is the degree at which Phobos orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Image of the Mars moon of Phobos

## Phobos Facts

Type | Moon |

Orbital Circumference | 58,907.79 km |

Furthest from parent (Apoasis) | 9,518 km |

Mass | 10,658,529,896,187,200 kg |

Density | 1.872 g/cm3 |

Volume | 5,729 km3 |

Year of Discovery | 1877 |

Discoverer | A. Hall |

Orbital Period | 0.3189 |

Rotation Period | 0.3189 Earth days |

Semi-Major Axis | 9,376 km |

Equatorial Circumference | 69.7 km |

Mean Radius | 11.1 km |

Surface Area | 1,548.30 km2 |

Surface Gravity | 0.0057 m/s2 |

Average Orbit Velocity | 7696.7 km/h |

Orbital Inclination | 1.075 |

Orbital Eccentricity | 0.0151 |

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