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Sedna is the outermost dwarf planet Candidate and object in the Solar System orbiting a distance from the Sun 5 times further than Pluto and Eris. It has not yet been considered as an official Dwarf Planet by the IAU.

Sedna
Sedna
Orbital characteristics
Aphelion

937 AU

Perihelion

76.361 AU

Semi-major axis

518.57 AU

Eccentricity

0.8527

Orbital

11,400 years

Synodic period

Unknown

Average orbital speed

1.04 km/s

Mean anomaly

358.01°

Inclination

11.927°

Longitude of ascending node

144.26°

Argument of perihelion

311.02°

Satellites

None

Physical characteristics
Mean radius

600 to 800 km

Flattening

N/A

Surface area

N/A

Mass

1.8–4.3 x 1021 kg

Mean density

2.0? g/cm3

Equatorial surface gravity

0.33 to 0.50 m/s2

Escape velocity

0.62 to 0.95 km/s

Sidereal rotation period

10 hours

Equatorial rotation velocity

Unknown

Axial tilt

Unknown

North pole right ascension

N/A

North pole declination

N/A

Albedo

0.16 to 0.30

Surface temp.

12 K

Apparent magnitude

Unknown

Angular diameter

N/A

Atmosphere
Surface pressure

Unknown

Compositions

Unknown

OrbitEdit

Sedna is famous for it's eccentric orbit. It goes as close as 76 AU and as far as 718 AU. In 2114 it will overtake Eris as the farthest dwarf planet orbiting the Sun. Close-up, Sedna probably looks like a reddish version of Neptune's moon Triton.

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