2015 BP519
2015 BP519, nicknamed Caju, is an extreme trans-Neptunian object from the scattered disc on a highly eccentric and inclined orbit in the outermost region of the Solar System. It was first observed on 17 January 2015, by astronomers with the Dark Energy Survey at Cerro Tololo Observatory (W84) in Chile. It has been described as an extended scattered disc object (ESDO), and fits into the group of extreme objects that led to the prediction of Planet Nine, and has the highest orbital inclination of any of these objects.
Orbital diagram of 2015 BP519 and other extreme objects along with hypothetical Planet Nine | |
| Discovery | |
|---|---|
| Discovered by | Dark Energy Survey |
| Discovery site | Cerro Tololo Obs. |
| Discovery date | 17 January 2015 (first observed only) |
| Designations | |
MPC designation | 2015 BP519 |
Alternative designations | Caju (nickname) |
Minor planet category | TNO · ESDO · ETNO distant |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 5 | |
| Observation arc | 3.22 yr (1,176 d) |
| Aphelion | 820 AU |
| Perihelion | 35.2 AU |
Semi-major axis | 428.03 AU |
| Eccentricity | 0.9178 |
Orbital period (sidereal) | 8856 yr (3,234,488 d) |
Mean anomaly | 358.39° |
Mean motion | 0° 0m 0.36s / day |
| Inclination | 54.125° |
Longitude of ascending node | 135.11° |
| ≈ 7 September 2058 ±1 month | |
| 348.37° | |
| Physical characteristics | |
Mean diameter | 524 km (est.) 584 km (est.) |
| 0.08 (assumed) 0.09 (assumed) | |
| 21.5 | |
| 4.4 | |
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