- Additional Information
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Additional Information
Short Description Sedna is a large minor planet in the outer reaches of the Solar System that was, as of 2015, at a distance of about 86 astronomical units from the Sun, about three times as far as Neptune. For most of its orbit, it is even farther from the Sun than at present, with its aphelion estimated at 937 AU (31 times Neptune's distance), making it one of the most distant known objects in the Solar System other than long-period comets. Its surface is one of the reddest among Solar System objects. 90377 Sedna - Wikipedia, the free encyclopedia Discovered by Michael Brown, Chad Trujillo, David Rabinowitz Discovery date 14 November 2003 Type TNO Satellite of Sun Minor planet number 90377 Orbit Prograde Rotation Direct Apoapsis 11 14 550 000 000 km Periapsis 10 1 142 300 000 km Semi-major axis 10 7 573 000 000 km Distance from Sun 03 506.2 au Eccentricity 0.854 91 Orbital period 11400 year Orbital speed 01 1.04 km/s Mean anomaly 358.163° Inclination to the ecliptic 011.928 72° Longitude of the ascending node 144.546° Argument of periapsis 311.29° Diameter/Size 04 1 060 ± 100 km Mass 1021×1 kg Density 01 2.0 g/cm3 Surface gravity 0.27 m/s2 Escape velocity 03 540 m/s Rotation period 10.273 hour | 0.4280 day Albedo geometric 0.32 ± 0.06 Temperature min 02 K Temperature mean 02 12 K Temperature max 02 K Apparent magnitude 21.1 Absolute magnitude 1.83 - Comments
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