# Praxidike, Moon of Jupiter

Praxidike is a Moon that orbits round the planet Jupiter. It is also know by other designations, JXXVII, S/2000 J7. Its mass is estimated/calculated at being 434,613,845,598,186 kg. Its density has been calculated at being 2.6. Its volume is 165.

Praxidike 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 625.3 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 3km. 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 15 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 21150, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Praxidike is 21.4 km. The surface area of Praxidike is 145.27. The surface gravity of the said item is 0.003. The Mean orbit velocity, that is the speed at which it orbits is 8734.50 km/h. The is the average distance in km of the object is from its parent 21148000.00.

The orbital inclination, the angle at which Praxidike orbits in relation to the orbital plane is 148.7 degrees. The orbital eccentricity is 0.2302, it is the degree at which Praxidike 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.

## Praxidike Facts

 Type Moon Designations JXXVII, S/2000 J7 Mass (kg) 434,613,845,598,186 Density (g/cm^3) 2.6 Volume (km^3) 165 Orbital Direction Retrograde, opposite to the parents direction Date of Discovery 23 November 2000 Discoverer Scott S. Sheppard, David C. Jewitt, Yanga R. Fernandez, and Eugene Magnier Orbital Period (days) 625.3 Equatorial Radius (km) 3 Albedo 0.04 Escape Velocity (km/h) 15 Semi-Major Axis (10^3 km) 21150 Equatorial Circumference (km) 21.4 Surface Area (km^2) 145.27 Surface Gravity (m/s^2) 0.003 Mean Orbit Velocity (km/h) 8734.50 Average Orbit Distance (km) 21148000.00 Orbital Inclination (degrees) 148.7 Orbital Eccentricity 0.2302 Source(s) https://solarsystem.nasa.gov/moons/jupiter-moons/praxidike/in-depth/https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html