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Hermippe, Moon of Jupiter

Hermippe is a Moon that orbits round the planet Jupiter. Its orbit circumference, the total distance it travels round its planetary parent is 132,310,864.30 km. The furthest it gets from its orbital parent (apoasis) is 25,821,990 km. Its density has been calculated at being 2.6 g/cm3. Its volume is Mass.

Hermippe was discovered on 9 December 2001 by Scott S. Sheppard, David C. Jewitt, and Jan T. Kleyna.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 633.91 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 21,300,000 km, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Hermippe is 12.6 km. The mean radius, that is the average radius of Hermippe is 2.0 (assuming an albedo of 0.04) km. The surface area of Hermippe 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 8,696.9 km/h.

The orbital inclination, the angle at which Hermippe orbits in relation to the orbital plane is 150.887 degrees. The orbital eccentricity is 0.2123, it is the degree at which Hermippe orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

How Hermippe was Named

The moon Hermippe is named after the Greek daughter of Boeotus, who was a son of Poseidon, the Greek God of the Waters. Hermippe married Orchomenus who was a son of Zeus. She would later have a child with Poseidon. Orchomenus became the legal father of the child. Wiki

If you read the NASA story, it will say that Hermippe bore a son called Orchomenus rather than actually marrying him. However, NASA does go onto say that the name was chosen because it ended with an "e" to indicate that the moon has a retrograde orbit, an orbit in reverse to the others. This policy is in accordance with the the International Astronomical Union policy of naming moons.

Ananke Moon Group

Ananke group of Jovian moons are all believed to have the same source, probably the result of a asteroid collision. The remnants were caught by the immense gravitational pull of Jupiter and remain in orbit ever since. The name derives it name from the largest in the group. All the members of the group orbit in a retrograde orbit hence why they all finish with the letter 'e' in their name.

List of Members in Ananke Group

Hermippe Facts

Orbital Circumference132,310,864.30 km
Furthest from parent (Apoasis)25,821,990 km
Density2.6 g/cm3
Orbital DirectionRetrograde, opposite to the parents direction
Date of Discovery9 December 2001
DiscovererScott S. Sheppard, David C. Jewitt, and Jan T. Kleyna
Orbital Period633.91
Semi-Major Axis21,300,000 km
Equatorial Circumference12.6 km
Mean Radius2.0 (assuming an albedo of 0.04) km
Surface Area50.27 km2
Surface Gravity0.002 m/s2
Average Orbit Velocity8,696.9 km/h
Orbital Inclination150.887
Orbital Eccentricity0.2123

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