(612911) 2004 XR₁₉₀

(612911) 2004 XR₁₉₀
	Hubble Space Telescope image of 2004 XR190, taken on October 2010
Discovery
Discovered by	CFEPS
Discovery site	Mauna Kea Obs.; (first observed only)
Discovery date	11 December 2004
Designations
MPC designation	(612911) 2004 XR190
Alternative designations	Buffy (nickname)
Minor planet category	TNO; detached; SDO; distant;
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
	Uncertainty parameter 3
Observation arc	14.74 yr (5,383 d)
Earliest precovery date	6 December 2002
Aphelion	63.401 AU
Perihelion	51.110 AU
Semi-major axis	57.255 AU
Eccentricity	0.1073
Orbital period (sidereal)	433.24 yr (158,242 d)
Mean anomaly	277.05°
Mean motion	0° 0m 8.28s / day
Inclination	46.794°
Longitude of ascending node	252.40°
Time of perihelion	≈ 4 April 2117; ±1 month
Argument of perihelion	285.56°
Physical characteristics
Mean diameter	335–530 km; 425–850 km; 561 km; 612 km; 350–784 km; 560+ km;
Geometric albedo	0.04–0.16; 0.09 (assumed); 0.10–0.25;
Apparent magnitude	21.8±0.2 (r-band); 21.9+0.8; −1.5 (G-band); 21.85±0.35 (wide-band); 21.8+0.7; −0.4 (several other bands);
Absolute magnitude (H)	4.3; 4.4; 4.47; 4.50; 4.6;

(612911) 2004 XR₁₉₀, nicknamed Buffy, is a trans-Neptunian object, classified as both a scattered disc object and a detached object, located in the outermost region of the Solar System. It was first observed on 11 December 2004, by astronomers with the Canada–France Ecliptic Plane Survey at the Mauna Kea Observatories, Hawaii, United States. It is the largest known highly inclined (> 45°) object. With a perihelion of 51 AU, it belongs to a small and poorly understood group of very distant objects with moderate eccentricities.

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(612911) 2004 XR190