54598 Bienor
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. As of 2020, Bienor is 14.2 AU from the Sun and will reach perihelion in January 2028. It measured approximately 198 kilometers (120 miles) in diameter.
| Discovery | |
|---|---|
| Discovered by | DES |
| Discovery site | Cerro Tololo Obs. |
| Discovery date | 27 August 2000 |
| Designations | |
MPC designation | (54598) Bienor |
| Pronunciation | /baɪˈiːnɔːr/ |
Named after | Biēnor |
Alternative designations | 2000 QC243 |
Minor planet category | Centaur |
| Adjectives | Bienorian /baɪ.ɪˈnɔːriən/ |
| Symbol | (astrological) |
| Orbital characteristics | |
| 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) |
Semi-major axis | 16.444 AU (2.4600 Tm) |
| Eccentricity | 0.19894 |
Orbital period (sidereal) | 66.68 yr (24355 d) |
Average orbital speed | 7.26 km/s |
Mean anomaly | 318.473° |
Mean motion | 0° 0m 53.039s / day |
| Inclination | 20.745° |
Longitude of ascending node | 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 | |
Mean diameter | 187.5±15.5 km 198 km 207±30 km |
Sidereal rotation period | 9.14 h (0.381 d) |
| 0.03–0.05 0.05±0.019 | |
| Temperature | ~ 69 K |
| BR B–V = 0.711±0.059 V–R = 0.476±0.046 | |
| ~ 19.2 | |
| 7.5 | |
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