# Helike, Moon of Jupiter

**Helike** is a Moon that orbits round the planet Jupiter. Its orbit circumference, the total distance it travels round its planetary parent is 131,634,048.78 km. The furthest it gets from its orbital parent (apoasis) is 24,154,089 km. Its mass is estimated/calculated at being 89,920,105,985,832 kg. Its density has been calculated at being 2.6 g/cm3. Its volume is 34 km3.

Helike was discovered on 6 February 2003 by Scott Sander Sheppard. Its orbital period, i.e. the period it takes to complete an orbit round Jupiter is 626.33 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 21,064,000 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 89,920,105,985,832 kg. The equatorial circumference of Helike is 12.6 km. The mean radius of Helike is 2.0 (assuming an albedo of 0.04) km. The surface area of Helike is 50.27 km2. The surface gravity of the said item is 0.002 m/s2. The average orbit velocity, that is the speed at which it orbits is 8,757.1 km/h.

The orbital inclination, the angle at which Helike orbits in relation to the orbital plane is 154.621 degrees. The orbital eccentricity is 0.1467, it is the degree at which Helike orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Helike Facts

Type | Moon |

Orbital Circumference | 131,634,048.78 km |

Furthest from parent (Apoasis) | 24,154,089 km |

Mass | 89,920,105,985,832 kg |

Density | 2.6 g/cm3 |

Volume | 34 km3 |

Date of Discovery | 6 February 2003 |

Discoverer | Scott Sander Sheppard |

Orbital Period | 626.33 |

Semi-Major Axis | 21,064,000 km |

Mass | 89,920,105,985,832 kg |

Equatorial Circumference | 12.6 km |

Mean Radius | 2.0 (assuming an albedo of 0.04) km |

Surface Area | 50.27 km2 |

Surface Gravity | 0.002 m/s2 |

Average Orbit Velocity | 8,757.1 km/h |

Orbital Inclination | 154.621 |

Orbital Eccentricity | 0.1467 |

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