# Phobos, Moon of Mars

Phobos is a Moon that orbits round the planet Mars. Its mass is estimated/calculated at being 10,658,529,896,187,200 kg. Its density has been calculated at being 1.872. Its volume is 5729.

It was discovered in the year 1877 by A. Hall.

The Equatorial Radius of the object is 11km. The value is the radius in km of the said object at the Equator.

The Escape Velocity of the object is 41 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 equatorial circumference of Phobos is 69.7 km. The surface area of Phobos is 1,548.30. The surface gravity of the said item is 0.0057. The Mean orbit velocity, that is the speed at which it orbits is 7696.70 km/h. The is the average distance in km of the object is from its parent 9376.00.

The orbital eccentricity is 0.0151, it is the degree at which Phobos orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

## Phobos Facts

 Type Moon Mass (kg) 10,658,529,896,187,200 Density (g/cm^3) 1.872 Volume (km^3) 5729 Year of Discovery 1877 Discoverer A. Hall Equatorial Radius (km) 11 Escape Velocity (km/h) 41 Equatorial Circumference (km) 69.7 Surface Area (km^2) 1,548.30 Surface Gravity (m/s^2) 0.0057 Mean Orbit Velocity (km/h) 7696.70 Average Orbit Distance (km) 9376.00 Orbital Eccentricity 0.0151 Source(s) https://solarsystem.nasa.gov/moons/mars-moons/phobos/in-depth/