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(42301) 2001 Ur163

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Title: (42301) 2001 Ur163  
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Subject: List of minor planets/42301–42400
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(42301) 2001 Ur163

(42301) 2001 UR163
Discovered by Kitt Peak (695)
Discovery date October 21, 2001
MPC designation (42301) 2001 UR163
Minor planet category

TNO (SDO)[2]

4:9 resonance[3]
Orbital characteristics[4]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 66.106 AU (9889.356 Gm)
Perihelion 36.756 AU (5498.582 Gm)
Semi-major axis 51.431 AU (7693.969 Gm)
Eccentricity 0.285
Orbital period 368.85 a (134721.208 d)
Average orbital speed 4.07 km/s
Mean anomaly 68.401°
Inclination 0.752°
Longitude of ascending node 301.769°
Argument of perihelion 342.639°
Physical characteristics
Dimensions 636 km (assumed)[5]
Albedo 0.09? (assumed)
Temperature ≈39 K
Spectral type (Super red; highest B-R) B-V=1.44; V-R=0.84; B-R=2.28
Apparent magnitude 21.2[6]
Absolute magnitude (H) 4.05[4]

(42301) 2001 UR163, also written as (42301) 2001 UR163, is a likely dwarf planet[7] that resides in the scattered disc. It was discovered on October 21, 2001 by the Deep Ecliptic Survey (DES) program at Kitt Peak. Light-curve-amplitude analysis shows only small deviations, suggesting that 2001 UR163 is a spheroid with small albedo spots.[8] Mike Brown's website lists it as a highly likely dwarf planet, but the diameter of the object has never been measured.[9]

2001 UR163 has the reddest color index of any object in the Solar System. On October 31, 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 orange-brown depending on its albedo.

It is currently 51.3 AU from the Sun,[6] and came to perihelion around 1937.[4]


External links

  • The Meudon Multicolor Survey (2MS) of Centaurs and Trans-Neptunian objects
  • TNO Colors
  • KBO Surface Colors
  • Ephemeris
  • Red Planetoid Sedna covered in tar-colored sludge
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