Neptune is named for the Roman god of the sea, who is identified with the Greek deity Poseidon, a son of the Titan Cronus (the Roman god Saturn) and a brother of Zeus (the Roman god Jupiter).It is the second planet to have been found by means of a telescope. In keeping … Thalassa circles the … As of October 2008, there are 213 known natural moons orbiting planets in our Solar System. By comparison, the next largest moon relative to a major planet (Triton of Neptune) has a diameter ratio of just .0546. Larissa (la-RISS-ah) has an irregular shape and appears heavily cratered, suggesting that it has an ancient surface with a total or relative lack of geological activity since its formation. The moon's mass is 7.35 x 10 22 kg, about 1.2 percent of Earth's mass. Of all the moons of the eight planets, Earth's moon is by far the largest relative to its planet, with a diameter of 3476 km and hence a ratio to Earth's diameter of 0.2764. 205 moons orbit the "full-size" planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune), while 8 moons orbit the smaller " dwarf planets " ( Ceres, Pluto, Haumea, Makemake, and Eris ). Each of the myriad particles that constitute the rings can be considered a tiny moon in its own orbit. Proteus is about 400 kilometers (250 miles) in diameter, larger than Nereid. Its diameter is about 190 kilometers (120 miles). It wasn't discovered from Earth because it is so close to Neptune that it is lost in the glare of reflected sunlight. The asteroid was named after the Greek city of Larissa. Larissa [LA-ree-suh] is the fifth known moon of Neptune. It shows no signs of geologic activity. ←==Hydra, Nix and P4== Hydra is the second largest moon of Pluto at a diameter of 61-150 km . Its existence was confirmed by Stephen p. Synnott during the passage of the Voyager probe 2 near Neptune in 1989. Being roughly half of Pluto's size Pluto and Charon orbit each other. They range from very tiny worlds of less than a kilometer in diameter to spherical moons such as Titan. Their shapes range from irregular worlds to ellipsoidal to almost completely rounded. The best measurement of Nereid's diameter comes from images taken by Voyager 2 in its August 1989 flyby of Neptune: 170 kilometers, plus or minus 25 (106 +/- 16 miles).
It is irregularly shaped and shows no sign of any geological modification. The Moon's diameter is over 50% greater than that of the dwarf planet Pluto. And the circumference of the Moon in miles is 6,783 miles. The moon's … It was named after a daughter of Pelasgua in Greek mythology. Thalassa appears to be about 80 kilometers (50 miles) in diameter. The as yet unnamed fourteenth moon, currently identified as S/2004 N 1, is thought to measure no more than 16–20 km in diameter. Proteus is named after the shape-changing sea god of Greek mythology. It was named after a daughter of Pelasgua in Greek mythology. It shows no signs of geologic activity. [/caption] The equatorial circumference of the Moon is 10,916 km. Two of Saturn’s moons (Janus Larissa is irregularly shaped and appears to have a heavily cratered surface. Larissa [LA-ree-suh] is the fifth known moon of Neptune. It orbits Neptune in 7 hours, 30 minutes about 25,200 kilometers (15,700 miles) above the cloud tops.
Unusual orbits. Neptune has 14 identified moons, as at September 2013, named for minor water deities in Greek mythology. The discovery of Larissa is usually credited to Harold Reitsma in 1982.
Neptune - Neptune - Neptune’s moons and rings: Neptune has at least 14 moons and six known narrow rings. The first of Saturn’s moons to be observed was Titan in 1655 by Christiaan Huygens, another moon was not found until 1671 when Giovanni Domenico Cassini discovered Iapetus. 1162 Larissa, provisional designation 1930 AC, is a metallic Hildian asteroid from the outermost regions of the asteroid belt, approximately 43 kilometers in diameter.It was discovered on 5 January 1930, by astronomer German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. Larissa. Put another way, Earth weighs 81 times more than the moon. Proteus circles Neptune at a distance of about 92,800 kilometers (57,700 miles) above the cloud tops, and completes one orbit in 26 hours, 54 minutes. Notable Moons – Triton, Nereid & Proteus.
Triton, the largest at more than 2,700 km in diameter, and the one first discovered soon after Neptune itself on October 10th 1846 by the English astronomer William Lassell, orbits in a Retrograde Orbit, in the opposite direction to most of the other moons. Proteus was originally designated S/1989 N 1. It was discovered by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen during an eclipse of star by Neptune May 24th, 1981. The most distant moon of Neptune is called Neso, and orbits so far away that it takes 26 years to make one trip around the planet. Like Saturn's moon Phoebe, Proteus reflects only six percent of the sunlight that hits it. Larissa is irregularly shaped and appears to have a heavily cratered surface. Neptune has moons which have unusual orbits.
It is irregularly shaped and shows no sign of any geological modification. The discovery of Larissa is usually credited to Harold Reitsma in 1982. Proteus is one of the darkest objects in our solar system.
How Proteus Got its Name.