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.[3] As of 2020, Bienor is 14.2 AU from the Sun[7] and will reach perihelion in January 2028.[3]

54598 Bienor

Discovery
Discovered by	DES
Discovery site	Cerro Tololo Obs.
Discovery date	27 August 2000
Designations
MPC designation	(54598) Bienor
Pronunciation	/baɪˈiːnɔːr/[1]
Named after	Biānor[2]
Alternative designations	2000 QC243
Minor planet category	Centaur [3]
Adjectives	Bienorian /baɪ.ɪˈnɔːriən/
Orbital characteristics [3]
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	66.68 yr (24355 d)
Average orbital speed	7.26 km/s
Mean anomaly	318.473°
Mean motion	0° 0^m 53.039^s / 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
Dimensions	207±30 km[4] 187.5±15.5 km[5]
Sidereal rotation period	9.14 h (0.381 d)[3]
Geometric albedo	0.03–0.05[4] 0.05±0.019[5]
Temperature	~ 69 K
Spectral type	B–V = 0.711±0.059[6] V–R = 0.476±0.046[6]
Apparent magnitude	~ 19.2[7]
Absolute magnitude (H)	7.5[3]

See also

• Minor planet
• Solar System

References

1. Noah Webster (1884) A Practical Dictionary of the English Language
2. perhaps confused with the Trojan warrior Βιήνωρ Biēnōr
3. "JPL Small-Body Database Browser: 54598 Bienor (2000 QC243)" (2020-11-11 last obs). Jet Propulsion Laboratory. Retrieved 20 December 2020.
4. Stansberry, J.; Grundy, W.; Brown, M.; Cruikshank, D. (20 February 2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope" (PDF). Cite journal requires |journal= (help)
5. Bauer, J. M.; Grav, T.; Blauvelt, E.; Mainzer, A. K. (August 2013). "Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations". The Astrophysical Journal. 773 (1): 11. arXiv:1306.1862. doi:10.1088/0004-637X/773/1/22.
6. Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. Retrieved 26 September 2019.
7. "AstDyS (54598) Bienor Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 20 December 2020.

External links

• 54598 Bienor at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 54598 Bienor at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters