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28978 Ixion

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28978 Ixion
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer Deep Ecliptic Survey
Discovery date 22 May 2001
Alternate
designations
2001 KX76 B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Plutino
Orbital elements C (http://asteroid.lowell.edu/)
Epoch
Eccentricity (e) 0.2416
Semi-major axis (a) 39.4851 AU
Perihelion (q) 30.0116 AU
Aphelion (Q) 49.0904 AU
Orbital period (P) 248 years
Mean orbital speed
Inclination (i) 19.627
Longitude of the
ascending node
(Ω)
71.027
Argument of
perihelion
(ω)
299.557
Mean anomaly (M)
Physical characteristics
Dimensions <822 km diameter
Mass
Density
Surface gravity
Escape velocity
Rotation period
Spectral class
Absolute magnitude 3.244
Albedo 15%
Mean surface
temperature

28978 Ixion (ik-sye'-un; Latin Ixīōn, Greek Ιξῑων) is a Kuiper belt object discovered on May 22 2001 with a diameter of < 822 km and a semimajor axis of about 39.5 AU. Ixion is a Plutino, meaning it has a 3:2 orbital resonance with Neptune.

Little is known about this object. The latest spectroscopy results indicate that the Ixionian surface is a mixture of dark carbon and tholin, which is a heteropolymer formed by irradiation of clathrates of water and organic compounds (such as methane or ethane).

28978 Ixion is named after Ixion, a figure from Greek mythology. It previously had the provisional designation 2001 KX76.

Reference

  • Pre-print (http://www.astro.helsinki.fi/~psr/Papers/Ixion-AAL.pdf) about Ixion's surface from the Planetary Systems Research group of the University of Helsinki.

da:2001 KX76 de:Ixion (Asteroid) fr:28978 Ixion nl:Ixion (planetode) ru:Иксион sl:28978 Iksion zh:小行星28978

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