541132 Leleākūhonua
541132 Leleākūhonua (/ˌlɛleɪɑːˌkuːhoʊˈnuːə/) (provisional designation 2015 TG387) is an extreme trans-Neptunian object and sednoid in the outermost part of the Solar System. It was first observed on 13 October 2015, by astronomers at the Mauna Kea Observatories, Hawaii. Based on its discovery date near Halloween and the letters in its provisional designation 2015 TG387, the object was informally nicknamed "The Goblin" by its discoverers and later named Leleākūhonua, comparing its orbit to the flight of the Pacific golden plover. It was the third sednoid discovered, after Sedna and 2012 VP113, and measures around 220 kilometers (140 miles) in diameter.
Orbital diagram of three of the four known sednoids: Leleākūhonua, Sedna and 2012 VP113 | |
| Discovery | |
|---|---|
| Discovered by | D. J. Tholen C. Trujillo S. S. Sheppard |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 13 October 2015 |
| Designations | |
MPC designation | (541132) Leleākūhonua |
| Pronunciation | English: /ˌlɛleɪɑːˌkuːhoʊˈnuːə/ Hawaiian: [lelejaːkuːhoˈnuwə] |
Alternative designations |
|
Minor planet category | TNO · sednoid |
| Orbital characteristics | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 4 · 9 | |
| Observation arc | 3.01 yr (1,101 d) |
| Aphelion | 2106±216 AU |
| Perihelion | 65.16±0.21 AU |
Semi-major axis | 1085±111 AU |
| Eccentricity | 0.93997±0.00636 |
Orbital period (sidereal) | 35760±5510 yr |
Mean anomaly | 359.418° |
Mean motion | 0° 0m 0.099s / day |
| Inclination | 11.654° |
Longitude of ascending node | 300.780° |
| ≈ 11 June 2078 ±4.5 months | |
| 117.778° | |
| Physical characteristics | |
Mean radius | 110+14 −10 km |
| 0.21+0.03 −0.05 | |
| 24.5 | |
| 5.50±0.13 | |
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