Solar System Exploration: Planets: Dwarf Planets: Eris: Facts & Figures

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Facts & Figures

Eris: Facts & Figures

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Facts & Figures

Discovered By

M. E. Brown, C. A. Trujillo and D. Rabinowitz

Date of Discovery

21 Oct. 2003

Orbit Size Around Sun (semi-major axis)

Metric: 10,180,122,852 km

English: 6,325,635,074 miles

Scientific Notation: 1.0180123 x 10¹⁰ km (6.8049918 x 10¹ A.U.)

By Comparison: 68.050

Perihelion (closest)

Metric: 5,765,732,799 km

English: 3,582,660,264 miles

Scientific Notation: 5.76573 x 10⁹ km (3.854 x 10¹ A.U.)

Aphelion (farthest)

Metric: 14,594,512,904 km

English: 9,068,609,883 miles

Scientific Notation: 1.45945 x 10¹⁰ km (9.756 x 10¹ A.U.)

Sidereal Orbit Period (Length of Year)

561.37 Earth years

Orbit Circumference

Metric: 60,841,487,025 km

English: 37,805,147,330 miles

Scientific Notation: 6.084 x 10¹⁰ km

By Comparison: 64.733

Average Orbit Velocity

Metric: 12,364 km/h

English: 7,682 mph

Scientific Notation: 3.4344 x 10³ m/s

Orbit Eccentricity

0.433628367

By Comparison: 25.948

Orbit Inclination

46.87

Sidereal Rotation Period (Length of Day)

1.079 Earth days

25.90000 hours

By Comparison: 1.08

NASA Official: Kristen Erickson

Advisory: Dr. James Green, Director of Planetary Science

Outreach Manager: Alice Wessen

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