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.
| Discovery | |
|---|---|
| Discovered by | D. J. Tholen C. Trujillo S. S. Sheppard |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 13 October 2015 |
| Designations | |
| (541132) Leleākūhonua | |
| Pronunciation | English: /ˌlɛleɪɑːˌkuːhoʊˈnuːə/ Hawaiian: [lelejaːkuːhoˈnuwə] |
| |
| 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 |
| 1085±111 AU | |
| Eccentricity | 0.93997±0.00636 |
| 35760±5510 yr | |
| 359.418° | |
| 0° 0m 0.099s / day | |
| Inclination | 11.654° |
| 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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