Universe Guide

Autonoe, Moon of Jupiter

Autonoe is a Moon that orbits round the planet Jupiter. It is also know by other designations, JXXVIII, S/2001 J1. Its mass is estimated/calculated at being 89,920,105,985,832 kg. Its density has been calculated at being 2.6. Its volume is 34.

Autonoe was discovered on 10 December 2001 by Scott S. Sheppard, David C. Jewitt and Jan T. Kleyna.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 762.7 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 2km. The Equatorial Radius is based on the assumption of the Albedo value. The value is the radius in km of the said object at the Equator.

The albedo of the object is 0.04. The Albedo is the amount of radiation that is reflected back into space by the object.

The Escape Velocity of the object is 9 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 23040, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Autonoe is 12.6 km. The surface area of Autonoe is 50.27. The surface gravity of the said item is 0.002. The Mean orbit velocity, that is the speed at which it orbits is 8056.60 km/h. The is the average distance in km of the object is from its parent 24033000.00.

The orbital inclination, the angle at which Autonoe orbits in relation to the orbital plane is 152.9 degrees. The orbital eccentricity is 0.3166, it is the degree at which Autonoe orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Autonoe in Greek Mythology

Autonoe was an ancient Greek Goddess who was the daughter of King Cadmus of Thebes and the goddess Harmonia. Thebes is a city in southern mainland Greece, that is you exclude the Greek Islands. Autonoe married Aristaeus who was a minor Greek God and had two children, Actaeon and Macris. Greek Mythology

The name Autonoe was chosen because it ends with the letter "e". According to NASA, moons that are retrograde in orbit end with the letter "e". The link at the time of writing referred to Jupiter but Jupiter is Roman whereas Autonoe is a Greek Legend.

Pasiphae Moon Group

Pasiphae group of Jovian Moons are all believed to have been created from the same source, notably through the result of an asteroid collision. The remnants were captured by Jupiters immense gravity and became satellites.

The largest of the group is Pasiphae from which the group gets it name from. Although, believed to be the result of a collision, confidence in this is lower than other groups because amongst other things, they all have differing colours, eccentricity and inclination.

There is doubt as to whether Sinope is from the same source as the others. It may exhibit some of the characteristics but there is more to indiciate that its source is elsewhere. Pasiphae contains 99% of the mass of the group without Sinope being included, otherwise it is down to 87% N.A.S.A.

List of Members in Pasiphae Group

Autonoe Facts

DesignationsJXXVIII, S/2001 J1
Mass (kg)89,920,105,985,832
Density (g/cm^3)2.6
Volume (km^3)34
Orbital DirectionRetrograde, opposite to the parents direction
Date of Discovery10 December 2001
DiscovererScott S. Sheppard, David C. Jewitt and Jan T. Kleyna
Orbital Period (days)762.7
Equatorial Radius (km)2
Escape Velocity (km/h)9
Semi-Major Axis (10^3 km)23040
Equatorial Circumference (km)12.6
Surface Area (km^2)50.27
Surface Gravity (m/s^2)0.002
Mean Orbit Velocity (km/h)8056.60
Average Orbit Distance (km)24033000.00
Orbital Inclination (degrees)152.9
Orbital Eccentricity0.3166

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