| Discovery | |
|---|---|
| Discovered by | DES |
| Discovery site | Cerro Tololo Obs. |
| Discovery date | 27 August 2000 |
| Designations | |
| (54598) Bienor | |
| Pronunciation | /baɪˈiːnɔːr/[1] |
Named after | Biēnor |
| 2000 QC243 | |
| Centaur [2] | |
| Adjectives | Bienorian /baɪ.ɪˈnɔːriən/ |
| Symbol |  (astrological) |
| Orbital characteristics [2] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 24775 days (67.83 yr) |
| Aphelion | 19.715 AU (2.9493 Tm) |
| Perihelion | 13.172 AU (1.9705 Tm) |
| 16.444 AU (2.4600 Tm) | |
| Eccentricity | 0.19894 |
| 66.68 yr (24355 d) | |
Average orbital speed | 7.26 km/s |
| 318.473° | |
| 0° 0m 53.039s / day | |
| Inclination | 20.745° |
| 337.728° | |
| 153.374° | |
| Earth MOID | 12.199 AU (1.8249 Tm) |
| Jupiter MOID | 7.873 AU (1.1778 Tm) |
| TJupiter | 3.575 |
| Physical characteristics | |
| 187.5±15.5 km[3] 198 km[4] 207±30 km[5] | |
| 9.14 h (0.381 d)[2] | |
| 0.03–0.05[5] 0.05±0.019[3] | |
| Temperature | ~ 69 K |
| BR[4] B–V = 0.711±0.059[6] V–R = 0.476±0.046[6] | |
| ~ 19.2[7] | |
| 7.5[2] | |
54598 Bienor /baɪˈiːnɔːr/ is a centaur that grazes the orbit of Uranus. It is named after the mythological centaur Bienor. Its closest approach to the Sun (perihelion) is 13.2 AU.[2] As of 2020[update], Bienor is 14.2 AU from the Sun[7] and will reach perihelion in January 2028.[2] It measured approximately 198 kilometers (120 miles) in diameter.[4]
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