Universe Guide

Callisto, Moon of Jupiter

Callisto is a Moon that orbits round the planet Jupiter. Its mass is estimated/calculated at being 107,593,737,963,819,000,000,000 kg. Its density has been calculated at being 1.834. Its volume is 58654577603.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 16.68902 days. The figure is also known as the sidereel period. The figure comes from N.A.S.A..

The Equatorial Radius of the object is 2410km. The value is the radius in km of the said object at the Equator.

The Escape Velocity of the object is 8,787 km/h. The Escape Velocity is the speed an object needs to be travelling in order to break free from the objects gravity. The larger an object is, the more velocity (speed) is needed to break free from the object.The Semi-Major Axis of the orbit is 1882.7, which is the furthest point from the centre to the edge of an elliptical point.

The atmospheric gases within the atmosphere of the object are Carbon dioxide.

The equatorial circumference of Callisto is 15144.4 km. The surface area of Callisto is 73,004,909.27. The surface gravity of the said item is 1.236. The Mean orbit velocity, that is the speed at which it orbits is 29531.60 km/h. The is the average distance in km of the object is from its parent 1882700.00.

The orbital inclination, the angle at which Callisto orbits in relation to the orbital plane is 0.19 degrees. The orbital eccentricity is 0.0074, it is the degree at which Callisto orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Callisto was one of the first moons to be spotted orbiting around a planet other than the moon. It was discovered by Galileo Galilei when he used his telescope to look at Jupiter. It was not the only moon to be discovered by Galileo, the others included Ganymede, Io and Europa. Of the four Galilean moons, Callisto is the furthest from the planet.

Callisto is the third largest moon in , only Ganymede and Titan are larger than Callisto. Callisto is larger than our own Moon. Callisto is a fraction and we are talking a fraction smaller than Mercury, the smallest planet in the solar system. Mercury's radius is 2,439Km whereas Callisto radius is 2,410 km.

Callisto is the most heavily crater filled moon in the solar system and that includes our own Moon. The moons surface is believed to date back over four billion years, nearly as old as the solar system. The planet is relatively flat with not much signs of geological activity such as volcanoes. It is referred to as a dead moon because of little activity. There is a belief amongst scientists that underneath the crust, there could be a salty oceanic water reservoir under. Colorado University

Callisto Impact Craters

As mentioned previously, Callisto doesn't have many large mountain, they if any possible be destroyed by the impacts. There are two large main areas of impact craters on the moon. The largest basin is named Valhalla after the Norse Mythological place where warriors go when they die to be cared for by Odin, the leader of the Norse Gods. The area has a central area which is 600 kilometers in diameter and extending to about 3000 kilometers.

The second area also named after Norse Mythology is Asgard. In Norse Mythology, Asgard is a location where the Gods ruled from. The Asgard are also a race of aliens in the Stargate series led by Thor. Getting back to the subject on hand though, the Asgard basin measures about 600 kilometers. SolarViews

Callisto Mythological Legend

According to Theoi, the character was spelt Kallisto with a K rather than the more familiar 'C'. The legend of Callisto is disputed but her character is the basis of the constellation of Ursa Major, the great bear. Callisto was a daughter of King Lykaon of Arkadia. She was a hunting companion of Artemis and was seduced by Zeus who was disguised as Artemis. Artemis is equivalent to Diana in the Roman Mythologies.

When it was discovered that Callisto was pregnant, she was expelled from the group. Callisto was transformed into a bear but who did the transforming is open to debate. Some stories have Callisto turned into a bear by Zeus, others have Hera, the wife of Zeus doing it. Also Artemis is blamed for turning Callisto into a bear. Callisto's child was also turned into a constellation, that is Ursa Minor.

Callisto, Xena Antagonist

If you were around in the nineties, you probably recall the television series Hercules and Xena. Callisto was primarily an antagonist of Xena. Xena destroyed Callisto's village when Callisto was young. Callisto set about gaining revenge on Xena through a series of episodes. The character does not end up as a bear however. The character is killed and is later reincarnated as Xena's daughter Eve.

Galilean Moons Moon Group

Galilean Moons are the four largest moons that orbit Jupiter. All four were discovered by Galileo Galilei when he looked up at Jupiter. Galileo is the Italian Astronomer who is credited with inventing the telescope.

List of Members in Galilean Moons Group

Image of the Jupiter moon of Callisto

Image of the Jupiter moon of Callisto

Callisto Facts

Mass (kg)107,593,737,963,819,000,000,000
Density (g/cm^3)1.834
Volume (km^3)58654577603
Orbital DirectionPrograde, same as the parents direction
Year of Discovery1610
Orbital Period (days)16.68902
Equatorial Radius (km)2410
Escape Velocity (km/h)8,787
Semi-Major Axis (10^3 km)1882.7
Atmosphere GassesCarbon dioxide
Equatorial Circumference (km)15144.4
Surface Area (km^2)73,004,909.27
Surface Gravity (m/s^2)1.236
Mean Orbit Velocity (km/h)29531.60
Average Orbit Distance (km)1882700.00
Orbital Inclination (degrees)0.19
Orbital Eccentricity0.0074

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