astro.wikisort.org - Asteroid

(42301) 2001 UR₁₆₃, prov. designation: 2001 UR₁₆₃, is a resonant trans-Neptunian object and possible dwarf planet located in the outermost region of the Solar System. The object measures approximately 352 kilometers (220 miles) in diameter with a high albedo and stays in an uncommon orbital resonance (4:9) with Neptune. It has the reddest color (RR-U) of any object in the Solar System. 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^[update], it has not been named.[1]

(42301) 2001 UR₁₆₃

Hubble Space Telescope image of 2001 UR163 taken in 2005
Discovery[1][2]
Discovered by	DES
Discovery site	Kitt Peak National Obs.
Discovery date	21 October 2001
Designations
MPC designation	(42301) 2001 UR163
Alternative designations	2001 UR163
Minor planet category	TNO[3] · 4:9 res[4][5] distant[1]
Orbital characteristics[3]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 2[1][3]
Observation arc	38.45 yr (14,045 d)
Aphelion	66.643 AU
Perihelion	36.987 AU
Semi-major axis	51.815 AU
Eccentricity	0.2862
Orbital period (sidereal)	372.98 yr (136,232 d)
Mean anomaly	80.814°
Mean motion	0° 0m 9.36s / day
Inclination	0.7531°
Longitude of ascending node	301.39°
Time of perihelion	8 October 1937
Argument of perihelion	344.50°
Physical characteristics
Mean diameter	352±85 km[4][6]: 26
Geometric albedo	0.209±0.08[4][6]
Spectral type	RR-U (super red)[7][8][6] B–V = 1.25±0.11[8] V–R = 0.88±0.06[8] V–I = 1.54±0.16[8]
Apparent magnitude	21.3[9]
Absolute magnitude (H)	4.21[1][3]

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 AU once every 372 years and 12 months (136,232 days; semi-major axis of 51.82 AU). Its orbit has an eccentricity of 0.29 and an inclination of 1° with respect to the ecliptic.[3] It came to 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^[update].[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 numbered (42301) by the Minor Planet Center on 26 May 2002 (M.P.C. 45686).[12] As of 2021^[update], 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

• List of Solar System objects most distant from the Sun

References

External links

• List Of Centaurs and Scattered-Disk Objects, Minor Planet Center
• The Meudon Multicolor Survey (2MS) of Centaurs and Trans-Neptunian objects
• TNO Colors
• KBO Surface Colors
• Red Planetoid Sedna covered in tar-colored sludge
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Discovery Circumstances: Numbered Minor Planets (40001)-(45000), Minor Planet Center
• (42301) 2001 UR₁₆₃, Small Bodies Data Ferret
• (42301) 2001 UR163 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (42301) 2001 UR163 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (42301) 2001 UR163

(42301) 2001 UR163 ist ein großes transneptunisches Objekt, das bahndynamisch als Resonantes KBO (4:9–Resonanz) eingestuft wird. Aufgrund seiner Größe ist der Asteroid ein Zwergplanetenkandidat. Besonders auffällig ist seine außergewöhnliche Rotfärbung, bislang die rötlichste im Sonnensystem.

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- [en] (42301) 2001 UR163

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[ru] (42301) 2001 UR163

(42301) 2001 UR163 — транснептуновый объект, расположенный в рассеянном диске[6]. Находится в резонансе 4:9 с Нептуном[7]. Кандидат в карликовые планеты[8]. Он был открыт 21 октября 2001 года программой глубокого исследования эклиптики (DES), в обсерватории Китт-Пик.

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