(42301) 2001 UR163
(42301) 2001 UR163 (provisional 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 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, it has not been named.
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° |
| 8 October 1937 | |
| 344.50° | |
| Physical characteristics | |
Mean diameter | 352±85 km: 26 |
| 0.209±0.08 | |
| |
| 21.3 | |
| 4.21 | |
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