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Neptune's natural satellites

From Academic Kids

Neptune has 13 known moons. The largest by far is Triton, discovered by William Lassell just 17 days after the discovery of Neptune itself. Two moons discovered in 2002 and 2003, as yet unnamed, have the largest orbital radii and longest orbital periods of any moons discovered to date.

The Natural Satellites

Name

(Pronunciation key)

Diameter (km) Mass
(1016 kg)
Mean orbital radius (km) Orbital period** (d)
Neptune III Naiad nye'-ad 58 ~19 48,227 0.294
Neptune IV Thalassa tha-las'-a 80 ~37 50,075 0.311
Neptune V Despina des-pee'-na 148 ~210 52,526 0.335
Neptune VI Galatea gal'-a-tee'-a 158 ~370 61,593 0.429
Neptune VII Larissa la-ris'-a 193 (208 × 178) ~490 73,548 0.555
Neptune VIII Proteus proe'-tee-us 418 (436 × 416 × 402) ~5,000 117,647 1.122
Neptune I Triton trye'-tun 2700 2,140,000 354,800 -5.877
Neptune II Nereid neer'-ee-id 340 ~3,100 5,513,400 360.14
S/2002 N 1* 60 ~9 15,728,000 -1879.71
S/2002 N 2* 38 ~9 22,422,000 2914.07
S/2002 N 3* 38 ~9 23,571,000 3167.85
S/2003 N 1* 28 ~1.5 46,695,000 -9115.91
S/2002 N 4* 60 ~9 48,387,000 -9373.99

* Awaiting confirmation and naming.
** Negative orbital periods indicate a retrograde orbit around Neptune (opposite to the planet's rotation)

Naming notes

Some asteroids share the same names as moons of Neptune: 74 Galatea, 1162 Larissa. Note that Triton did not have an official name until the 20th century. Although the name was suggested in 1880 by Camille Flammarion, it did not come into common use until at least the 1930s. Usually, it was simply known as "the satellite of Neptune" (the second satellite, Nereid, was not discovered until 1949).

See also


Neptune's natural satellites

edit  (http://footwww.academickids.com/encyclopedia/index.php?title=Template:Neptune_Footer&action=edit)

Naiad | Thalassa | Despina | Galatea | Larissa | Proteus | Triton | Nereid
S/2002 N 1 | S/2002 N 2 | S/2002 N 3 | S/2003 N 1 | S/2002 N 4
see also: The Solar System


Our Solar System
Sun | Mercury | Venus | Earth (Moon) | Mars | Asteroid belts
Jupiter | Saturn | Uranus | Neptune | Pluto | Kuiper belt | Oort cloud
See also astronomical objects and the solar system's list of objects, sorted by radius or mass
bs:Neptunovi prirodni sateliti

zh:海王星的自然卫星

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