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Callisto, Moon of Jupiter

Callisto is a Moon that orbits round the planet Jupiter. Its orbit circumference, the total distance it travels round its planetary parent is 11,829,191.03 km. The furthest it gets from its orbital parent (apoasis) is 1,896,632 km. 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 g/cm3. Its volume is 58,654,577,603 km3. It was discovered in the year 1610 by Galileo Galilei. Its orbital period, i.e. the period it takes to complete an orbit round Jupiter is 16.69 days. The figure is also known as the sidereel period. The figure comes from N.A.S.A.. Its takes 16.6890184 Earth days to do a full rotation period.

The Semi-Major Axis of the orbit is 1,882,700 km, 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 mass of the object is calculated at being 107,593,737,963,819,000,000,000 kg. The equatorial circumference of Callisto is 15,144.4 km. The mean radius of Callisto is 2,410.3 km. The surface area of Callisto is 73,004,909.27 km2. The surface gravity of the said item is 1.236 m/s2. The average orbit velocity, that is the speed at which it orbits is 29,531.6 km/h.

The orbital inclination, the angle at which Callisto orbits in relation to the orbital plane is 0.192 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 the solar system, 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 propably 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.

Image of the Jupiter moon of Callisto

Image of the Jupiter moon of Callisto

Callisto Facts

Orbital Circumference11,829,191.03 km
Furthest from parent (Apoasis)1,896,632 km
Mass107,593,737,963,819,000,000,000 kg
Density1.834 g/cm3
Volume58,654,577,603 km3
Year of Discovery1610
DiscovererGalileo Galilei
Orbital Period16.69
Rotation Period16.6890184 Earth days
Semi-Major Axis1,882,700 km
Atmosphere GassesCarbon dioxide
Mass107,593,737,963,819,000,000,000 kg
Equatorial Circumference15,144.4 km
Mean Radius2,410.3 km
Surface Area73,004,909.27 km2
Surface Gravity1.236 m/s2
Average Orbit Velocity29,531.6 km/h
Orbital Inclination0.192
Orbital Eccentricity0.0074

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