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]
Discovery | |
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Discovered by | DES |
Discovery site | Cerro Tololo Obs. |
Discovery date | 27 August 2000 |
Designations | |
MPC designation | (54598) Bienor |
Pronunciation | /baɪˈiːnɔːr/[1] |
Named after | Biēnor |
Alternative designations | 2000 QC243 |
Minor planet category | Centaur [2] |
Adjectives | Bienorian /baɪ.ɪˈnɔːriən/ |
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) |
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° |
Argument of perihelion | 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[3] 198 km[4] 207±30 km[5] |
Sidereal rotation period | 9.14 h (0.381 d)[2] |
Geometric albedo | 0.03–0.05[5] 0.05±0.019[3] |
Temperature | ~ 69 K |
Spectral type | BR[4] B–V = 0.711±0.059[6] V–R = 0.476±0.046[6] |
Apparent magnitude | ~ 19.2[7] |
Absolute magnitude (H) | 7.5[2] |
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