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(126155) 2001 YJ140 (provisional designation 2001 YJ140) is a resonant trans-Neptunian object from the outermost regions of the Solar System, approximately 154 kilometers in diameter. It discovered on 20 December 2001, by American astronomers Chad Trujillo, Glenn Smith and Michael E. Brown at the Palomar Observatory in California.[1]
| Discovery | |
|---|---|
| Discovered by | M. E. Brown C. Trujillo Glenn Smith |
| Discovery site | Palomar Obs. |
| Discovery date | 20 December 2001 |
| Designations | |
| (126155) 2001 YJ140 | |
| none | |
| TNO · plutino | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 2455 days (6.72 yr) |
| Aphelion | 51.307 AU (7.6754 Tm) |
| Perihelion | 27.906 AU (4.1747 Tm) |
| 39.606 AU (5.9250 Tm) | |
| Eccentricity | 0.29542 |
| 249.26 yr (91043.2 d) | |
| 10.650° | |
| 0° 0m 14.235s / day | |
| Inclination | 5.9691° |
| 319.51° | |
| 129.91° | |
| Physical characteristics | |
| Dimensions | 154 km (Johnston's Archive) |
| 7.3 | |
2001 YJ140 is classified as a plutino, a large class of objects in a 2:3 orbital resonance with Neptune. Its orbit has a semi-major axis of 42.396 AU and an orbital period of about 249 years. Perihelion leads to 27.881 AU from the Sun and its aphelion in the distance of 51.348 AU.[2][3]
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