Proteus is a Moon that orbits round the planet Neptune. Its orbit circumference, the total distance it travels round its planetary parent is 739,191.57 km. The furthest it gets from its orbital parent (apoasis) is 117,705 km. Its mass is estimated/calculated at being 50,355,259,352,065,700,000 kg. Its density has been calculated at being 1.3 g/cm3. Its volume is 38,792,386 km3. It was discovered in the year 1989 by S. Synnott, Voyager 2. Its orbital period, i.e. the period it takes to complete an orbit round Neptune is 1.122 days. The figure is also known as the sidereel period. The figure comes from N.A.S.A..
The Semi-Major Axis of the orbit is 117,646 km, which is the furthest point from the centre to the edge of an elliptical point.
The mass of the object is calculated at being 50,355,259,352,065,700,000 kg. The equatorial circumference of Proteus is 1,319.5 km. The mean radius of Proteus is 210.0 km. The surface area of Proteus is 554,176.94 km2. The surface gravity of the said item is 0.76 m/s2. The average orbit velocity, that is the speed at which it orbits is 27,450.7 km/h.
The orbital inclination, the angle at which Proteus orbits in relation to the orbital plane is 0.075 degrees. The orbital eccentricity is 0.0005, it is the degree at which Proteus orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.
Proteus is the largest moon that is not fully spherical in shape. Had the moon been slightly more massive, it would have been spherical. It is probably an asteroid that was captured from the Oort cloud when it strayed too closely. It is the second largest of the Neptunian moons. The largest is Triton, which accounts for 95% of all objects that are currently in orbit round Neptune.
Proteus was only discovered when the Voyager 2 Space Probe flew by. A smaller moon, Nereid had been discovered 33 years earlier by a ground based telescope. Proteus is a dark moon, it hardly reflects any sunlight, in fact, it only reflects about 6% of the light it receives which goes someway to explaining why it took so long to spot.
it is named like all the other Neptunian moons after a Greek Mythological character with a connection to either Neptune or Poseidon, the god of the seas. Proteus was an old sea god whom was a herdsman for Poseidons seals.
|Orbital Circumference||739,191.57 km|
|Furthest from parent (Apoasis)||117,705 km|
|Year of Discovery||1989|
|Discoverer||S. Synnott, Voyager 2|
|Semi-Major Axis||117,646 km|
|Equatorial Circumference||1,319.5 km|
|Mean Radius||210.0 km|
|Surface Area||554,176.94 km2|
|Surface Gravity||0.76 m/s2|
|Average Orbit Velocity||27,450.7 km/h|