| Satellite Name |
Orbital Semimajor Axis (km) |
Orbital Period (days) |
Mass (kg) |
Discovery |
| Discoverer Name |
Announcement Date |
| Naiad |
4.8227·104 |
0.294396 |
~1.9·1017 |
Voyager 2 Team |
1989 |
| Thalassa |
5.0075·104 |
0.311485 |
~3.5·1017 |
R. Terrile |
1989 |
| Despina |
5.2526·104 |
0.334655 |
~2.1·1018 |
S. Synnott and the Voyager 2 Team |
1989 |
| Galatea |
6.1953·104 |
0.428745 |
2.12·1018 |
| Larissa |
7.3548·104 |
0.554654 |
~4.2·1018 |
H. Reitsema, et al. |
1989 |
| Proteus |
1.17647·105 |
1.122315 |
~5·1019 |
S. Synnott and the Voyager 2 Team |
1989 |
| Triton |
3.5476·105 |
5.876854 |
2.147·1022 |
W. Lassell |
1846 |
| Nereid |
5.5134·106 |
360.13619 |
~3.1·1019 |
G. P. Kuiper |
1949 |
| Halimede |
1.5728·107 |
1879.7 |
~9·1016 |
J. J. Kavelaars, et al. |
2003 Jan 13 |
| Sao |
2.2422·107 |
2914.1 |
~9·1016 |
J. J. Kavelaars, et al. |
2003 Jan 13 |
| Laomedeia |
2.3571·107 |
3167.9 |
~9·1016 |
J. J. Kavelaars, et al. |
2003 Jan 13 |
| Psamathe |
4.6695·107 |
9115.9 |
~1.5·1016 |
M. Holman, et al. |
2003 Sep 3 |
| Neso |
4.8387·107 |
9374.0 |
~9·1016 |
M. Holman, et al. |
2003 Sep 30 |
