Planet Neptune Data

Orbital Elements
Semimajor Axis:30.0699 AU
Eccentricity:0.00859
Inclination:1.7700°
Argument of Perifocus:273.2°
Longitude of Ascending Node:131.784°
Mean Motion:0.0060200767° per day
Time of Periapsis:2046 Nov 13
Orbital Period:163.72321 years
Mass:17.204 ME
Equatorial Radius (1 bar):3.8830 RE
Rotational Inclination:29.56°
Rotational Period:15.97 hours

Satellites

Satellite Name Orbital Semimajor Axis (km) Orbital Period (days) Mass (kg) Discovery
Discoverer NameAnnouncement Date
Naiad 4.8227·1040.294396~1.9·1017 Voyager 2 Team1989
Thalassa 5.0074·1040.311485~3.5·1017 R. Terrile1989
Despina 5.2526·1040.334655~2.1·1018 S. Synnott and the Voyager 2 Team1989
Galatea 6.1953·1040.4287452.12·1018
Larissa 7.3548·1040.554654~4.2·1018 H. Reitsema, et al.1989
Hippocamp 1.05284·1050.950~1016 M. Showalter, et al.2013 Jul 15
Proteus 1.17646·1051.122315~5·1019 S. Synnott and the Voyager 2 Team1989
Triton 3.54759·1055.8768542.147·1022 W. Lassell1846
Nereid 5.513818·106360.13619~3.1·1019 G. P. Kuiper1949
Halimede 1.6681·1071879.33~9·1016 J. J. Kavelaars, et al.2003 Jan 13
Sao 2.2619·1072919.16~9·1016 J. J. Kavelaars, et al.2003 Jan 13
Laomedeia 2.3613·1073175.62~9·1016 J. J. Kavelaars, et al.2003 Jan 13
Psamathe 4.6705·1079128.74~1.5·1016 M. Holman, et al.2003 Sep 3
Neso 5.0258·1079880.63~9·1016 M. Holman, et al.2003 Sep 30

1 AU = 1.49597870691·1011 m            1 year = 365.25 days = 31557600 s
1 ME = 5.9742·1024 kg            1 RE = 6.378136·106 m

The URL of this page is: http://www.princeton.edu/~willman/planetary_systems/Sol/Neptune
This page was last updated: 2020 October 2
You may contact Alex at: willman@Princeton.EDU
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