Moons of Neptune

Name

Discoverer

Year of Discovery

Distance from Center of Neptune (mi)*

Distance from Center of Neptune (km)*

Diameter (mi)

Diameter (km)

Sidereal Period of Revolution (Days) †

Despina

Voyager spacecraft

1989

32,640

52,530

92

148

0.33

Galatea

Voyager spacecraft

1989

38,500

61,960

98

158

0.43

Larissa

Voyager spacecraft

1989

45,700

73,550

119

192

0.55

Naiad

Voyager spacecraft

1989

29,970

48,230

36

58

0.29

Nereid

G.P. Kuiper

1949

3,423,290

5,509,100

211

340

359.63

Proteus

Voyager spacecraft

1989

73,100

117,640

258

416

1.12

Thalassa

Voyager spacecraft

1989

31,100

50,070

50

80

0.31

Triton

W. Lassell

1846

220,470

354,800

1,678

2,700

5.88