| Discovery[1] | |
|---|---|
| Discovered by | S. S. Sheppard D. J. Tholen C. Trujillo |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 5 March 2019 |
| Designations | |
| 2019 EU5 | |
| TNO[2] · ESDO (detached)[3] · ETNO · distant[4] | |
| Orbital characteristics (barycentric)[5] | |
| Epoch 21 January 2022 (JD 2459600.5) | |
| Uncertainty parameter 4[2] | |
| Observation arc | 5.03 yr (1,837 days) |
| Earliest precovery date | 6 January 2016 |
| Aphelion | 2,395 AU |
| Perihelion | 46.759 AU |
| 1,221 AU | |
| Eccentricity | 0.9617 |
| 42,630 yr | |
| 359.331° | |
| 0° 0m 0.083s / day | |
| Inclination | 18.207° |
| 109.227° | |
| 109.204° | |
| Physical characteristics | |
Mean diameter | 160–220 km (est. 0.1–0.2)[6] |
| 25.6[1] | |
| 6.35±0.14[2][4] | |
2019 EU5 is an extreme trans-Neptunian object from the scattered disc on a highly eccentric orbit in the outermost region of the Solar System. It was discovered on 5 March 2019, by American astronomers Scott Sheppard, David Tholen, and Chad Trujillo at Mauna Kea Observatories in Hawaii, and announced on 17 December 2021.[1] It was 83.4 astronomical units from the Sun when it was discovered, making it one of the most distant known Solar System objects from the Sun as of December 2021[update].[1] It has been identified in precovery images from 6 January 2016.[2]