Triton

! colspan="2" style="background: #bddb1c; text-align:center;" | Discovery ! colspan="2" style="background: #a0c0ff; text-align:center;" | Orbital characteristics ! colspan="2" style="background: #c0a5a0; text-align:center;" | Physical characteristics
 * + Triton
 * Date || December 12, 1898
 * Discovered by || Camille Flammarion
 * Discovered by || Camille Flammarion
 * Discovered by || Camille Flammarion
 * 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
 * Orbital period || 1.2876 a
 * Inclination || (to Neptune's equator) 14.59°
 * Satellite of || Neptune
 * Satellite of || Neptune
 * Satellite of || Neptune
 * 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
 * }
 * Rotation period || 16.43 h
 * Surface temp. || mean: 203 K
 * Axial tilt || 65.5°
 * Albedo || 0.55
 * }
 * 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.