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Mass Radius Mean density Visual geometric albedo

(1020 kg) (km) (kg/m3)

Naiad (NIII) 0.002 48 x 30 x 26 0.07

Thalassa (NIV) 0.004 54 x 50 x 26 0.09

Despina (NV) 0.02 90 x 74 x 64 0.09

Galatea (NVI) 0.04 102 x 92 x 72 0.08

Larissa (NVII) 0.05 108 x 102 x 84 0.09

Proteus (NVIII) 0.5 220 x 208 x 202 0.10

Triton (NI) 214. 1,353.4 2,050 0.76

Nereid (NII) 0.3 170 0.16

Neptune has 13 known satellites.

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10y ago

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