(42301) 2001 UR163

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(42301) 2001 UR163
Perihelion
36.987 AU
51.815 AU
Eccentricity0.2862
372.98 yr (136,232 d)
80.814°
0° 0m 9.36s / day
Inclination0.7531°
301.39°
8 October 1937
344.50°
Physical characteristics
Mean diameter
352±85 km[4][6]: 26 
0.209±0.08[4][6]
21.3[9]
4.21[1][3]

(42301) 2001 UR163 (

albedo and stays in an uncommon orbital resonance (4:9) with Neptune. It was discovered on 21 October 2001 by astronomers of the Deep Ecliptic Survey program at Kitt Peak National Observatory near Tucson, Arizona, United States. As of 2021, it has not been named.[1]

Classification and orbit

2001 UR163 has been characterized as a

dwarf planet candidate.[10] Based on assumptions and estimates, Michael Brown gives it a "likely"-status on his website, which is the third highest status after "near certainty" and "highly likely" (also see his classification table).[11]

The object orbits the Sun at a distance of 37.0–66.6 

perihelion on 8 October 1937, and has since been moving away from the Sun.[3] In 2006, it moved beyond a distance of 50 AU and is at 53.7 AU as of 2021.[9] The body's observation arc begins with a precovery, published by the Digitized Sky Survey and taken at the Siding Spring Observatory in July 1982.[1]

Numbering and naming

2001 UR163 was

M.P.C. 45686).[12] As of 2021, it has not been named.[1] Acoording to the established naming conventions, it will receive a mythological or mythic name (not necessarily from Classical mythology), in particular one associated with creation.[13]

Physical characteristics

Lightcurve analysis shows only small deviations, suggesting that 2001 UR163 is a spheroid with small albedo spots.[10] Observations with Spitzer's Infrared Array Camera were used to study the body's surface composition. The analyzed data indicate the presence of 20% water ice, 60% amorphous silicates, and 20% organic compounds, including complex ones such as tholins.[6]
: 20 

Diameter and albedo

2001 UR163 measures approximately 352 kilometers (220 miles) in diameter with a high

albedo of 0.209.[4][6]
: 26 

Based on previous estimates published on the Lightcurve Data Base and on Michael Brown's website, 2001 UR163 measures between 531 km (330 mi) and 583 kilometers (360 miles), using an assumed intermediate surface albedo of 0.09 to 0.10 with an absolute magnitude of 4.49 and 4.4, respectively.[7][11]

See also

References

  1. ^ a b c d e f g "42301 (2001 UR163)". Minor Planet Center. Retrieved 27 July 2021.
  2. Minor Planet Electronic Circulars. Archived from the original
    on 11 April 2010. (K01UG3R*)
  3. ^ a b c d e f "JPL Small-Body Database Browser: 42301 (2001 UR163)" (2021-01-08 last obs.). Jet Propulsion Laboratory. Retrieved 27 July 2021.
  4. ^ a b c d Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 27 July 2021.
  5. ^ Marc W. Buie. "Orbit Fit and Astrometric record for 42301". SwRI–Southwest Research Institute. Retrieved 27 July 2021.The Deep Ecliptic Survey Object Classifications
  6. ^
    S2CID 234003733
    .
  7. ^ a b "LCDB Data for (42301)". Asteroid Lightcurve Database (LCDB). Retrieved 27 July 2021.
  8. ^
    doi:10.1016/j.icarus.2014.12.004
    .
  9. ^ a b "Asteroid (42301) 2001 UR163 – Ephemerides". AstDyS-2, Asteroids – Dynamic Site, Department of Mathematics, University of Pisa. Retrieved 27 July 2021.
  10. ^
    ISSN 0019-1035
    .
  11. ^ a b Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 31 August 2016.
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 July 2021.
  13. ^ "Naming of Astronomical Objects – Minor planets". IAU – International Astronomical Union. Retrieved 27 July 2021.

External links


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