28978 Ixion

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 (planetoïde) ru:Иксион sl:28978 Iksion zh:小行星28978

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