Ixion

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Ixion
28978 Ixion is a plutino (an object that has a 2:3 orbital resonance with Neptune). It is very likely to be a dwarf planet. It has a diameter of approximately 650 km, making it about the fifth-largest plutino. It is moderately red in visible light and has a surface made of a mixture of tholin and water ice. Ixion and Pluto follow similar but differently oriented orbits: Ixion’s perihelion is below the ecliptic whereas Pluto's is above it. 28978 Ixion - Wikipedia, the free encyclopedia
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Short Description 28978 Ixion is a plutino (an object that has a 2:3 orbital resonance with Neptune). It is very likely to be a dwarf planet. It has a diameter of approximately 650 km, making it about the fifth-largest plutino. It is moderately red in visible light and has a surface made of a mixture of tholin and water ice. Ixion and Pluto follow similar but differently oriented orbits: Ixion’s perihelion is below the ecliptic whereas Pluto's is above it. 28978 Ixion - Wikipedia, the free encyclopedia
Discovered by Deep Ecliptic Survey, Cerro Tololo (807)
Discovery date 22 May 2001
Type TNO
AddInfo Plutino
Satellite of Sun
Minor planet number 28978
Orbit Prograde
Rotation Direct
Apoapsis 10 7 338 200 000 km
Periapsis 10 4 481 400 000 km
Semi-major axis 10 5 909 900 000 km
Distance from Sun 02 39.505 au
Eccentricity 0.241 71
Orbital period 248.30 years | 90 692.7 days
Orbital speed 01 4.665 km/s
Mean anomaly 280.540°
Inclination to the ecliptic 019.619°
Longitude of the ascending node 071.019°
Argument of periapsis 299.730°
Diameter/Size 03 617 km
Mass 1020×2.3 kg
Density  1.0 g/cm3
Surface gravity  0.11 m/s2
Escape velocity 03 280 m/s
Albedo geometric 0.141
Temperature mean 02 44 K
Apparent magnitude 19.6
Absolute magnitude 3.828
Angular diameter 0.022″
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