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<title>Neptunian Satellite Fact Sheet</title>
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<h3>Neptunian Satellite Fact Sheet</h3>
<img src="../images/neptune">Neptune
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<h5>Bulk parameters</h5>
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                            Mass          Radius       Mean density V.Geo.Albedo
                         (10<sup>20</sup> kg)         (km)          (kg/m<sup>3</sup>)
 
  Naiad (NIII)                              29                             0.06
  Thalassa (NIV)                            40                             0.06
  Despina (NV)                              74                             0.06
  Galatea (NVI)                             79                             0.06
  Larissa (NVII)                         104 x 89                          0.06
  Proteus (NVIII)                    218 x 208 x 201                       0.06
  Triton (NI)             214.7          1,352.6          2,054            0.7
  Nereid (NII)                             170                             0.2
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<h5>Orbital parameters</h5> 
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                                 Semimajor axis            Period*  Inclination  
                            (10<sup>3</sup> km)  (Neptunian Radii)    (days)    
  Naiad (NIII)               48.227        1.948          0.294396      4.74        
  Thalassa (NIV)             50.075        2.022          0.311485      0.21       
  Despina (NV)               52.526        2.121          0.334655      0.07       
  Galatea (NVI)              61.953        2.502          0.428745      0.05        
  Larissa (NVII)             73.548        2.970          0.554654      0.20       
  Proteus (NVIII)           117.647        4.751          1.122315      0.55        
  Triton (NI)               354.76        14.328          5.876854R   156.834
  Nereid (NII)            5,513.4        222.67         360.13619       7.23       
*R indicates retrograde motion
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