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NASA diagram shows the presumed distance of the Oort cloud compared to the solar system planets, the Kuiper belt, and the orbit of Sedna.

Date of discovery Date of discovery::November 14, 2003
Name of discoverer Discoverer::Michael E. Brown, C. Trujillo, D. Rabinowitz
Orbital characteristics
Celestial class Member of::Trans-Neptunian object
Primary Primary::Sun
Perihelion Periapsis::76.361 AU
Aphelion Apoapsis::937 AU
Semi-major axis Semi-major axis::518,57 AU
Orbital eccentricity Orbital eccentricity::0.8527
Physical characteristics
Color Color::#FFFFFF

Sedna or 90377 Sedna is a trans-Neptunian object discovered in 2003, which lies about three times farther from the Sun than Neptune. Many astronomers consider it a dwarf planet.[1][2][3]

Comparison of the eight brightest TNOs: Eris, Pluto, Makemake, Haumea, Sedna, 2007 OR10, Quaoar, and Orcus


  1. Barucci, et al. (2010). "(90377) Sedna: Investigation of surface compositional variation". The Astronomical Journal 140: 6. 
  2. Rabinowitz, Schaefer, Tourtellotte, 2011. "SMARTS Studies of the Composition and Structure of Dwarf Planets". Bulletin of the American Astronomical Society, Vol. 43
  3. Malhotra, 2010. "On the Importance of a Few Dwarf Planets". Bulletin of the American Astronomical Society, Vol. 41

See Also