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Elara, Moon of Jupiter

Elara is a Moon that orbits round the planet Jupiter. Its orbit circumference, the total distance it travels round its planetary parent is 72,891,344.30 km. The furthest it gets from its orbital parent (apoasis) is 14,293,493 km. Its mass is estimated/calculated at being 869,227,691,196,372,000 kg. Its density has been calculated at being 2.6 g/cm3. Its volume is 333,038 km3.

It was discovered in the year 1905 by Charles Dillon Perrine.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 259.64 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 11,741,000 km, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Elara is 43.0 km. The mean radius, that is the average radius of Elara is 43.0 (assuming an albedo of 0.04) km. The surface area of Elara is 23,235.22 km2. The surface gravity of the said item is 0.031 m/s2. The average orbit velocity, that is the speed at which it orbits is 11,697.5 km/h.

The orbital inclination, the angle at which Elara orbits in relation to the orbital plane is 26.627 degrees. The orbital eccentricity is 0.2174, it is the degree at which Elara orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Legend of Elara

the moon, the eighth largest Jovian moon is named after one of Zeus, the King of the Gods' lovers. Zeus is the Greek equivalent to the Roman god Jupiter. Elara became pregnant with Zeus' child and was hidden by Zeus in the underworld from Hera, Zeus's wife.

The name was chosen because it ended in the letter "a" which according to the International Astronomical Unions guidelines for Jovian moons, orbits in the same direction as Jupiter. Those moons that are retrograde end with the letter "e" such as Autonoe. NASA

Himalia Moon Group

The moon is a member of the Himalia group of Jovian Moons. All four Himalia moons in the group orbit in a prograde direction, this means they orbit in the same direction as Jupiter. They are all believed to be from the same source, possibly the remnants of an asteroid that got broken up in a collision. Himalia is the largest member of the group therefore it is the one that the group is named after. It takes just over two thirds the time the moon takes to orbit the Earth as Himalia takes to orbit Jupiter. NASA

List of Members in Himalia Group

Elara Facts

Orbital Circumference72,891,344.30 km
Furthest from parent (Apoasis)14,293,493 km
Mass869,227,691,196,372,000 kg
Density2.6 g/cm3
Volume333,038 km3
Orbital DirectionPrograde, same as the parents direction
Year of Discovery1905
DiscovererCharles Dillon Perrine
Orbital Period259.64
Semi-Major Axis11,741,000 km
Equatorial Circumference43.0 km
Mean Radius43.0 (assuming an albedo of 0.04) km
Surface Area23,235.22 km2
Surface Gravity0.031 m/s2
Average Orbit Velocity11,697.5 km/h
Orbital Inclination26.627
Orbital Eccentricity0.2174

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