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Themisto, Moon of Jupiter

Themisto is a Moon that orbits round the planet Jupiter. Its orbit circumference, the total distance it travels round its planetary parent is 46,467,175.95 km. The furthest it gets from its orbital parent (apoasis) is 9,326,697 km. Its mass is estimated/calculated at being 689,387,479,224,709 kg. Its density has been calculated at being 2.6 g/cm3. Its volume is 268 km3.

Themisto was discovered on 30 September 1975 by First time: Charles Thomas Kowal and Elizabeth Roemer.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 130.02 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 7,507,000 km, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Themisto is 25.1 km. The mean radius, that is the average radius of Themisto is 4.0 (assuming an albedo of 0.04) km. The surface area of Themisto is 201.06 km2. The surface gravity of the said item is 0.003 m/s2. The average orbit velocity, that is the speed at which it orbits is 14,891.0 km/h.

The orbital inclination, the angle at which Themisto orbits in relation to the orbital plane is 43.068 degrees. The orbital eccentricity is 0.2424, it is the degree at which Themisto orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Themisto's Mythology Legend

Themisto is named after the daughter of the Greek river god Inachus. Themisto so many other characters in Greek mythology was a lover of Zeus. Themisto would bear a child Ister. When Hera, wife of Zeus found out, Themisto was changed into a bear as revenge.

Themisto Moon Group

Themisto is an unique moon of Jupiter and is therefore the only one of its group. Most of the other moons orbit in groups like Carme. Thermisto orbits in the direction as the planet.

List of Members in Themisto Group

Themisto Facts


TypeMoon
Orbital Circumference46,467,175.95 km
Furthest from parent (Apoasis)9,326,697 km
Mass689,387,479,224,709 kg
Density2.6 g/cm3
Volume268 km3
Orbital DirectionPrograde, same as the parents direction
Date of Discovery30 September 1975
DiscovererFirst time: Charles Thomas Kowal and Elizabeth Roemer
Orbital Period130.02
Semi-Major Axis7,507,000 km
Equatorial Circumference25.1 km
Mean Radius4.0 (assuming an albedo of 0.04) km
Surface Area201.06 km2
Surface Gravity0.003 m/s2
Average Orbit Velocity14,891.0 km/h
Orbital Inclination43.068
Orbital Eccentricity0.2424


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