Solar System Exploration: Planets: Neptune: Moons: Triton: Facts & Figures

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Facts & Figures

Triton: Facts & Figures

Back to Neptune

Facts & Figures

Discovered By

W. Lassell

Date of Discovery

1846

Orbit Size Around Neptune (semi-major axis)

Metric: 354,759 km

English: 220,437 miles

Periapsis (closest)

Metric: 354,759 km

Apoapsis (farthest)

Metric: 354,759 km

Orbit Period (Length of Year)

5.877 Earth days

By Comparison: Retrograde orbit

Orbit Circumference

Metric: 2,229,016.54 km

Average Orbit Velocity

Metric: 15,803.2 km/h

Orbit Eccentricity

0

Orbit Inclination

156.865 degrees

By Comparison: Retrograde orbit

Mean Radius

Metric: 1353.4 km

Equatorial Circumference

Metric: 8,503.7 km

Volume

Metric: 10,384,058,491 km³

Mass

Metric: 21,394,990,550,895,500,000,000 kg

Scientific Notation: 2.1395 x 10²² kg

Density

Metric: 2.059 g/cm³

Surface Area

Metric: 23,017,714.99 km²

Surface Gravity

Metric: 0.779 m/s²

Escape Velocity

Metric: 5,229 km/h

English: 3,249 mph

Scientific Notation: 1452 m/s

Rotation Period (Length of Day)

By Comparison: Synchronous with orbital period

Atmospheric Temperature
(at level with pressure = 1 bar)

Scientific Notation: 38 K

NASA Official: Kristen Erickson

Advisory: Dr. James Green, Director of Planetary Science

Outreach Manager: Alice Wessen

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