(42301) 2001 UR163

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The correct title of this article is (42301) 2001 UR163. It features superscript or subscript characters that are substituted or omitted because of technical limitations.
(42301) 2001 UR163
Discovery
Discovered by Deep Ecliptic Survey[1]
Discovery date October 21, 2001
Designations
MPC designation (42301) 2001 UR163
Alternative names none
Minor planet
category		 ESDO
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 9889.356 Gm (66.106 AU)
Perihelion 5498.582 Gm (36.756 AU)
Semi-major axis 7693.969 Gm (51.431 AU)
Eccentricity 0.285
Orbital period 134721.208 d (368.85 a)
Average orbital speed 4.07 km/s
Mean anomaly 68.401°
Inclination 0.75235 [degree (angle)
Longitude of ascending node 301.769°
Argument of perihelion 342.639°
Physical characteristics
Dimensions 636 km[2]
Mass 2.7×1020? kg
Mean density 2.0? g/cm³
Equatorial surface gravity 0.1778? m/s²
Escape velocity 0.3362? km/s
Sidereal rotation
period		 ? d
Albedo 0.10?
Temperature ~39 K
Spectral type (Super RED;highest B-R) B-V=1.44; V-R=0.84; B-R=2.28
Absolute magnitude 3.97

(42301) 2001 UR163, also written as (42301) 2001 UR163, is a trans-Neptunian object (TNO) that resides in the extended Scattered disc. It was discovered on October 21, 2001 by the Deep Ecliptic Survey (DES) program at Kitt Peak.

2001 UR163 has the REDDEST color index of any object in the solar system. On October 31st, 2002, the 3.6 meter Canada-France-Hawaii telescope observed 2001 UR163 set a record RED reading of B-R=2.28. This makes 2001 UR163 even redder than 5145 Pholus, (119070) 2001 KP77, 90377 Sedna, and comet C/2001 T4. Reddening of the spectrum is caused by cosmic irradiaton by ultraviolet radiation and charged particles. Becoming bluer in the spectrum is caused by impact collisions exposing the interior of an object. In the visible spectrum 2001 UR163 would appear an orange-brown depending on its albedo.

[edit] References

  1. ^ List Of Centaurs and Scattered-Disk Objects
  2. ^ List of known trans-Neptunian objects

[edit] External links

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