Neptune's Known Satellites

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Overhead or Top Down View ............................ Side or Edge-on View



 Neptune Satellite Data 
Name                          a        i       e       Peri    Node    M        Period  mag    H      Size Year
                             (km)      (deg)           (deg)   (deg)   (deg)    (days)         (mag)  (km)
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Regular Satellites                                      
III   Naiad       S/1989 N6     48200  4.74    0.000   36.7    49.0    334.9    0.294   24.1          58   1989 
IV    Thalassa    S/1989 N5     50100  0.205   0.000   316.3   90.2    193.6    0.311   23.4          80   1989 
V     Despina     S/1989 N3     52500  0.065   0.000   331.1   154.9   319.6    0.335   22.0          148  1989 
VI    Galatea     S/1989 N4     62000  0.054   0.000   107.4   112.5   187.1    0.429   22.0          158  1989  
VII   Larissa     S/1989 N2     73500  0.201   0.001   139.9   10.3    34.9     0.555   21.5          192  1989 
                  S/2004 N1    105300  0.000   0.000   000.0   00.0    00.0     0.950   26.5          18   2013 
VIII  Proteus     S/1989 N1    117600  0.039   0.000   309.5   150.3   114.2    1.122   20.0          416  1989 
Irregular Groups   
I     Triton                   354800  156.8   0.000   344.0   172.4   264.8    5.88    13.0          2706 1846 
II    Nereid                  5513400  7.23    0.751   280.8   334.8   359.3    360.1   19.2          340  1949 
IX    Halimede    S/2002 N1  15728000  134.1   0.571   159.5   202.7   96.8     1879.7  24.5          61   2002 
XI    Sao         S/2002 N2  22422000  48.51   0.293    19.5   58.9    129.4    2914.1  25.4          40   2002 
XII   Laomedeia   S/2002 N3  23571000  34.74   0.424   138.0   53.5    321.1    3167.9  25.4          40   2002 
X     Psamathe    S/2003 N1  46695000  137.4   0.450   145.9   301.0   206.2    9115.9  25.6          38   2003 
XIII  Neso        S/2002 N4  48387000  132.6   0.495    89.3   49.9    269.8    9374.0  24.6          60   2002 

a - The mean semi-major axis.
i - The mean inclination.
e - The mean eccentricity.
Peri - The argument of Pariaphis.
Node - The longitude of the ascending node.
M - The mean anomaly.
Period - The time of one revolution around Neptune.
mag - The optical magnitude of the object (R-band).
H - The absolute magnitude of the object.
Size - The diameter of the object.
Year - The year of discovery.

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zoomed in view showing the inner satellites.

 
Scott S. Sheppard's Home Page
e-mail: ssheppard at carnegiescience.edu (replace the "at" with @)

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See info on all the planetary satellites at The Giant Planet Satellite Page