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 5.0075·1040.311485~3.5·1017 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
S/2004 N 1 1.042·1050.9362  M. Showalter, et al.2013 Jul 15
Proteus 1.17647·1051.122315~5·1019 S. Synnott and the Voyager 2 Team1989
Triton 3.5476·1055.8768542.147·1022 W. Lassell1846
Nereid 5.5134·106360.13619~3.1·1019 G. P. Kuiper1949
Halimede 1.5728·1071879.7~9·1016 J. J. Kavelaars, et al.2003 Jan 13
Sao 2.2422·1072914.1~9·1016 J. J. Kavelaars, et al.2003 Jan 13
Laomedeia 2.3571·1073167.9~9·1016 J. J. Kavelaars, et al.2003 Jan 13
Psamathe 4.6695·1079115.9~1.5·1016 M. Holman, et al.2003 Sep 3
Neso 4.8387·1079374.0~9·1016 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: 2013 July 16
You may contact Alex at: willman@Princeton.EDU

Go Back to the table of Sol Planetary System Data
Go Back to the table of Known Planetary Systems
Go Back to the list of Alex Willman's Recent Work
Go Back to Alex Willman's Home Page