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Harpalyke, Moon of Jupiter

Harpalyke is a Moon that orbits round the planet Jupiter. It is also know by other designations, JXXII, S/2000 J5. Its mass is estimated/calculated at being 119,893,474,647,775 kg. Its density has been calculated at being 2.6. Its volume is 45.

Harpalyke was discovered on 23 November 2000 by Scott S. Sheppard, David C. Jewitt, Yanga R. Fernandez, and Eugene Magnier.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 623.3 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 10 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 21110, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Harpalyke is 13.8 km. The surface area of Harpalyke is 60.82. The surface gravity of the said item is 0.002. The Mean orbit velocity, that is the speed at which it orbits is 8749.50 km/h. The is the average distance in km of the object is from its parent 21104000.00.

The orbital inclination, the angle at which Harpalyke orbits in relation to the orbital plane is 148.7 degrees. The orbital eccentricity is 0.2261, it is the degree at which Harpalyke orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Ananke Moon Group

Ananke group of Jovian moons are all believed to have the same source, probably the result of a asteroid collision. The remnants were caught by the immense gravitational pull of Jupiter and remain in orbit ever since. The name derives it name from the largest in the group. All the members of the group orbit in a retrograde orbit hence why they all finish with the letter 'e' in their name.

List of Members in Ananke Group

Harpalyke Facts

DesignationsJXXII, S/2000 J5
Mass (kg)119,893,474,647,775
Density (g/cm^3)2.6
Volume (km^3)45
Orbital DirectionRetrograde, opposite to the parents direction
Date of Discovery23 November 2000
DiscovererScott S. Sheppard, David C. Jewitt, Yanga R. Fernandez, and Eugene Magnier
Orbital Period (days)623.3
Equatorial Radius (km)2
Escape Velocity (km/h)10
Semi-Major Axis (10^3 km)21110
Equatorial Circumference (km)13.8
Surface Area (km^2)60.82
Surface Gravity (m/s^2)0.002
Mean Orbit Velocity (km/h)8749.50
Average Orbit Distance (km)21104000.00
Orbital Inclination (degrees)148.7
Orbital Eccentricity0.2261

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