Hegemone is a Moon that orbits round the planet Jupiter. It is also know by other designations, JXXXIX, S/2003 J8. Its mass is estimated/calculated at being 44,960,052,992,916 kg. Its density has been calculated at being 2.6. Its volume is 14.
Hegemone was discovered on 8 February 2003 by Scott S. Sheppard, David C. Jewitt, Jan T. Kleyna, Yanga R. Fernandez, and Henry H. Hsieh.
The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 739.6 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 7 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 23950, which is the furthest point from the centre to the edge of an elliptical point.
The equatorial circumference of Hegemone is 9.4 km. The surface area of Hegemone is 28.27. The surface gravity of the said item is 0.001. The Mean orbit velocity, that is the speed at which it orbits is 8086.60 km/h. The is the average distance in km of the object is from its parent 23566000.00.
The orbital inclination, the angle at which Hegemone orbits in relation to the orbital plane is 155.2 degrees. The orbital eccentricity is 0.3439, it is the degree at which Hegemone orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.
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.
|Designations||JXXXIX, S/2003 J8|
|Orbital Direction||Retrograde, opposite to the parents direction|
|Date of Discovery||8 February 2003|
|Discoverer||Scott S. Sheppard, David C. Jewitt, Jan T. Kleyna, Yanga R. Fernandez, and Henry H. Hsieh|
|Orbital Period (days)||739.6|
|Equatorial Radius (km)||2|
|Escape Velocity (km/h)||7|
|Semi-Major Axis (10^3 km)||23950|
|Equatorial Circumference (km)||9.4|
|Surface Area (km^2)||28.27|
|Surface Gravity (m/s^2)||0.001|
|Mean Orbit Velocity (km/h)||8086.60|
|Average Orbit Distance (km)||23566000.00|
|Orbital Inclination (degrees)||155.2|
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