(612911) 2004 XR190
(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.
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 | |
| 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° |
| ≈ 4 April 2117 ±1 month | |
| 285.56° | |
| Physical characteristics | |
Mean diameter |
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