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Triton
Discovery
Date December 12, 1898
Discovered by Camille Flammarion
Orbital characteristics
Semi-major axis 141,920,441 km
Eccentricity 0.00523
Orbital period 1.2876 a
Inclination (to Neptune's equator) 14.59°
Satellite of Neptune
Physical characteristics
Mean diameter 139403 km
Mass 2.1066×10^27 kg
Mean density 1.485 kg/dm³
Surface gravity 28.84 N/kg
Rotation period 16.43 h
Surface temp. mean: 203 K
Axial tilt 65.5°
Albedo 0.55

Triton is a gas giant in the Neptunian system. It has also been designated Neptunus b and SolEb.

Natural satellites

Triton has 15 confirmed satellites, of which 7 exceeds a mass of 10^21 kg. Triton I is a strange moon, in that it has an own satellite.

The massive satellites:


Triton VI

  • semi-major axis = 399,940 km
  • diameter
  • mass = 9.56*10^21 kg
  • orbital period =


Triton VII

  • semi-major axis = 431,832 km
  • diameter
  • mass = 2.12*10^21
  • orbital period =


Triton II

  • semi-major axis = 598,104 km
  • diameter =
  • mass = 10.23*10^24 kg
  • orbital period = 2.837 d


Triton V

  • semi-major axis =
  • diameter =
  • mass = 102.91*10^21 kg
  • orbital period = 4.256 d
  • eccentricity = 0.12


Triton III

  • semi-major axis =
  • diameter =
  • mass = 13.57*10^24 kg
  • orbital period = 5.674 d


Triton I

  • semi-major axis = 1,507,216 km
  • diameter =
  • mass = 14.38*10^24 kg
  • orbital period = 11.349 d
  • Hill sphere 198,244 km


Triton IV

  • semi-major axis =
  • diameter =
  • mass = 2.22*10^24 kg
  • orbital period = 26.068 d

Trojans

Triton's leading Lagrange point is occupied by a double asteroid with considerable sizes, while the trailing point is occupied by a major planet, Nereid, and its moons.

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