(184212) 2004 PB112, prov. 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]
Discovery[1] | |
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Discovered by | M. W. Buie |
Discovery site | Cerro Tololo Obs. |
Discovery date | 13 August 2004 |
Designations | |
MPC designation | (184212) 2004 PB112 |
Alternative designations | 2004 PB112 |
Minor planet category | 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 |
Semi-major axis | 109.97 AU |
Eccentricity | 0.6787 |
Orbital period (sidereal) | 1153.20 yrs |
Mean anomaly | 3.0647° |
Mean motion | 0° 0m 3.24s / day |
Inclination | 15.403° |
Longitude of ascending node | 356.73° |
Argument of perihelion | 3.6578° |
Physical characteristics | |
Mean diameter | 154 km (est. at 0.09)[3][6] |
Absolute magnitude (H) | 7.3[1][2] |
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 2021[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]
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