90377 Sedna
So far out that a single orbit takes over 11,000 years and it never comes closer than 76 AU.
Where it is right now
90377 Sedna is in Taurus, 83.2 AU away, magnitude 20.8.
Computed for 2 August 2026, 17:00 UTC, and recomputed at least hourly. This page is cached, so treat the line above as accurate to the hour rather than to the second. The map shows the live position.
Position from a Kepler propagation of the published elements below, accurate to about an arcminute.
Facts
Every line carries the source it came from.
- Diameter
- 996 kmSource: Published occultation and Herschel/Spitzer radiometry results
- Orbital period
- 12,679 yearsSource: NASA/JPL Small-Body Database
- Distance from the Sun
- 543.720 AU on averageSource: NASA/JPL Small-Body Database
- Orbit shape
- eccentricity 0.860, inclined 11.9 degrees to the eclipticSource: NASA/JPL Small-Body Database
- Class
- Trans-neptunian objectSource: NASA/JPL Small-Body Database
- Discovered
- 2003-Nov-14 by Brown, M. E., Trujillo, C. A., Rabinowitz, D.Source: NASA/JPL Small-Body Database
Physical size
- Mean radius
- 498 km
- Diameter
- 996 km across
- Absolute magnitude H
- 1.50
Orbit
Elements are heliocentric, referred to the J2000.0 ecliptic.
- Average distance from the Sun
- 543.7 AU
- Closest and furthest
- 76.185 AU (11,397.1 million km) to 1,011.3 AU
- Eccentricity
- 0.8599, highly elongated
- Inclination to the ecliptic
- 11.93 degrees
- Orbital period
- 12,679 years
- Longitude of ascending node
- 144.51 degrees
- Argument of periapsis
- 311.10 degrees
- Mean anomaly at J2000.0
- 357.85 degrees
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Catalog id sedna. 3,172 objects on the map, of which 171 are hand-authored with sourced facts.