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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.

The 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 equatorial circumference of Helike is 12.6 km. The mean radius, that is the average 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.

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

Helike Facts

Orbital Circumference131,634,048.78 km
Furthest from parent (Apoasis)24,154,089 km
Mass89,920,105,985,832 kg
Density2.6 g/cm3
Volume34 km3
Orbital DirectionRetrograde, opposite to the parents direction
Date of Discovery6 February 2003
DiscovererScott Sander Sheppard
Orbital Period626.33
Semi-Major Axis21,064,000 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 Velocity8,757.1 km/h
Orbital Inclination154.621
Orbital Eccentricity0.1467

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