(42301) 2001 UR₁₆₃

(42301) 2001 UR₁₆₃
	Hubble Space Telescope image of 2001 UR163 taken in 2005
Discovery
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 · 4:9 res; distant
Orbital characteristics
	Epoch 1 July 2021 (JD 2459396.5)
	Uncertainty parameter 2
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°
Known satellites	0
Physical characteristics
Mean diameter	352±85 km
Geometric albedo	0.209±0.08
Spectral type	RR-U (very red); B–V = 1.25±0.11; V–R = 0.88±0.06; V–I = 1.54±0.16;
Apparent magnitude	21.3
Absolute magnitude (H)	4.21

(42301) 2001 UR₁₆₃ (provisional designation 2001 UR₁₆₃) is a resonant trans-Neptunian object 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 was discovered on 21 October 2001 by astronomers of the Deep Ecliptic Survey program at Kitt Peak National Observatory near Tucson, Arizona, United States.