| Discovery [1] | |
|---|---|
| Discovered by | M. W. Buie |
| Discovery site | Cerro Tololo Obs. |
| Discovery date | 13 August 2004 |
| Designations | |
| (184212) 2004 PB112 | |
| 2004 PB112 | |
| TNO [2] · SDO [3] [4] res 4:27 [5] | |
| Orbital characteristics [2] | |
| Epoch 1 July 2021 (JD 2459396.5) | |
| Uncertainty parameter 3 [2] ·0 [1] | |
| Observation arc | 17.07 yr (6,236 d) |
| Aphelion | 184.60 AU |
| Perihelion | 35.333 AU |
| 109.97 AU | |
| Eccentricity | 0.6787 |
| 1153.20 yrs | |
| 3.0647° | |
| 0° 0m 3.24s / day | |
| Inclination | 15.403° |
| 356.73° | |
| 3.6578° | |
| Physical characteristics | |
| 154 km (est. at 0.09) [3] [6] | |
| 7.3 [1] [2] | |
(184212) 2004 PB112 (provisional designation 2004 PB112) is a trans-Neptunian object from the scattered disc, approximately 154 kilometers (96 miles) in diameter, and in a rare high-order orbital resonance ratio (4:27) with Neptune. It was discovered on 13 August 2004, by American astronomer Marc Buie at the Cerro Tololo Inter-American Observatory in Chile. [1]
2004 PB112 orbits the Sun at a distance of 35.3–184.6 AU once every 1153 years and 2 months (421,205 days; semi-major axis of 109.97 AU). Its orbit has a high eccentricity of 0.68 and an inclination of 15° with respect to the ecliptic. [2] A first precovery was taken at Cerro Tololo in 2000, extending the body's observation arc by 4 years prior to its official discovery observation. [1]
2004 PB112 reached perihelion on 5 October 2011 (JD 2455839.806). [2] It has been classified as a highly unusual 4:27 resonant trans-Neptunian object, [5] : 49 but also simply as a scattered disc object, [3] or SCATNEAR, respectively, by the Deep Ecliptic Survey. [4]
This minor planet was numbered (184212) by the Minor Planet Center on 20 April 2008 ( M.P.C. 62608). [7] As of 2025 [update] , it has not been named. [1]
Based on a generic conversion from an absolute magnitude of 7.2, 2004 PB112 measures between 100 and 220 kilometer in diameter. [6] Johnston's Archive estimates a mean diameter of 154 kilometers (96 miles) assuming a typical albedo of 0.09. [3]
