1 day / second

0.5 AU

90377 Sedna

Dwarf Planet

A distant dwarf planet with an extremely elongated 11,400-year orbit that takes it between 76 and 937 AU from the Sun, making it one of the most remote known objects in the Solar System.

Key Facts

orbital regime

Inner Oort Cloud

learn more

Wikipedia

mass

2.5000e+21 kg

radius

453 km

hill radius

0.057 AU

semi-major axis

506 AU

eccentricity

0.85

inclination

11.931º

longitude of the ascending node

144.248º

argument of periapsis

311.352º

orbital period

11,382.146 years

surface gravity

0.083 g

class

sednoid

discovery date

November 14, 2003

discovered by

Michael E. Brown, Chad Trujillo, and David Rabinowitz at Palomar Observatory

name origins

Named after Sedna, the Inuit goddess of the sea and marine animals

albedo

0.07

material composition

Believed to be a mixture of rock and ice
Other Dwarf Planets
Pluto
Ceres
Quaoar
Orcus
Haumea
Eris