# Lysithea, Moon of Jupiter

Lysithea is a Moon that orbits round the planet Jupiter. Its mass is estimated/calculated at being 62,944,074,190,082,100 kg. Its density has been calculated at being 2.6. Its volume is 24429.

Lysithea was discovered on 6 July 1938 by Seth Barnes Nicholson.

The orbital period, i.e. the period it takes to complete an orbit round Jupiter is 259.22 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 18km. 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 78 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 11720, which is the furthest point from the centre to the edge of an elliptical point.

The equatorial circumference of Lysithea is 113.1 km. The surface area of Lysithea is 4,071.50. The surface gravity of the said item is 0.013. The Mean orbit velocity, that is the speed at which it orbits is 11797.00 km/h. The is the average distance in km of the object is from its parent 11717000.00.

The orbital inclination, the angle at which Lysithea orbits in relation to the orbital plane is 27.35 degrees. The orbital eccentricity is 0.1124, it is the degree at which Lysithea orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Legend of Lysithea

Lysithea was one of many lovers of Zeus. As he had got Lysithea pregnant, he promised to do whatever Lysithea asked of him. Hera, Zeus' wife tricked Lysithea into getting Zeus to come to Lysithea in the same way Zeus wooed Hera. When Zeus came, he accidentally set the room alight and caused Lysithea to die of fright. Zeus managed to save the baby foetus and he sew it into his thigh. When the baby reached birthing time, he undone the stitches and out popped Dionysus.

## Himalia Moon Group

The moon is a member of the Himalia group of Jovian Moons. All four Himalia moons in the group orbit in a prograde direction, this means they orbit in the same direction as Jupiter. They are all believed to be from the same source, possibly the remnants of an asteroid that got broken up in a collision. Himalia is the largest member of the group therefore it is the one that the group is named after. It takes just over two thirds the time the moon takes to orbit the Earth as Himalia takes to orbit Jupiter. NASA

## Lysithea Facts

 Type Moon Mass (kg) 62,944,074,190,082,100 Density (g/cm^3) 2.6 Volume (km^3) 24429 Orbital Direction Prograde, same as the parents direction Date of Discovery 6 July 1938 Discoverer Seth Barnes Nicholson Orbital Period (days) 259.22 Equatorial Radius (km) 18 Albedo 0.04 Escape Velocity (km/h) 78 Semi-Major Axis (10^3 km) 11720 Equatorial Circumference (km) 113.1 Surface Area (km^2) 4,071.50 Surface Gravity (m/s^2) 0.013 Mean Orbit Velocity (km/h) 11797.00 Average Orbit Distance (km) 11717000.00 Orbital Inclination (degrees) 27.35 Orbital Eccentricity 0.1124 Source(s) https://solarsystem.nasa.gov/moons/jupiter-moons/lysithea/in-depth/https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html