|
Mean distance from the Sun (AU) |
30.109 |
|
Sidereal period of orbit (years) |
164.79 |
|
Equatorial radius (km) |
24,764 |
|
Polar radius (km) |
24,340 |
|
Body rotation period (hours) |
16.11 |
|
Tilt of equator to orbit (degrees) |
28.8 |
|
Number of observed satellites |
8 |
|
NO |
NAME OF MOON |
DISTANCE FROM NEPTUNE(KM) |
ORBITAL PERIOD |
DIAMETER (KM) |
YEAR OF DISCOVERY |
DISCOVERED BY |
|
1 |
NAIAD |
48,000 |
7h:06m |
58 |
1989 |
VOYAGER2 |
|
2 |
THALASSA |
50,000 |
7h:30m |
80 |
1989 |
VOYAGER2 |
|
3 |
DESPINA |
52,500 |
8h |
148 |
1989 |
VOYAGER2 |
|
4 |
GALATEA |
62,000 |
10h:18m |
158 |
1989 |
VOYAGER2 |
|
5 |
LARISSA |
73,600 |
13h:18m |
208 x 178 |
1989 |
VOYAGER2 |
|
6 |
PROTEUS |
117,600 |
1.12 days |
400 |
1989 |
VOYAGER2 |
|
7 |
TRITON |
354,800 |
50.88 days |
2700 |
1846 |
W. LASSELL |
|
8 |
NEREID |
5513,400 |
360 days |
340 |
1949 |
G. KUIPER |