(612911) 2004 XR190
Astronomical observation
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(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. Wikipedia
Mean diameter: 335–530 km; 425–850 km; 561 km; 612 km; 350–784 km; 560+ km;
Discoverers: Brett J. Gladman, John J. Kavelaars, Phil Nicholson, and more
Discovered: December 11, 2004
Minor planet category: TNO; detached; SDO; distant;
Orbital period (sidereal): 433.24 yr (158,242 d)
Semi-major axis: 57.255 AU