54598 Bienor
{{Use dmy dates|date=July 2021}}
{{Infobox planet
| minorplanet = yes
| background = #C7FF8F
| name = 54598 Bienor
| symbol = 24px (astrological)
| discoverer = DES
| discovery_site = Cerro Tololo Obs.
| discovered = 27 August 2000
| mpc_name = (54598) Bienor
| alt_names = {{mp|2000 QC|243}}
| pronounced = {{IPAc-en|b|aɪ|ˈ|iː|n|ɔːr}}Noah Webster (1884) A Practical Dictionary of the English Language
| named_after = Biēnor
| adjective = Bienorian {{IPAc-en|b|aɪ|.|ᵻ|ˈ|n|ɔər|i|ə|n}}
| mp_category = Centaur
| epoch = 31 May 2020 (JD 2459000.5)
| semimajor = {{Convert|16.444|AU|Tm|abbr=on}}
| perihelion = {{Convert|13.172|AU|Tm|abbr=on}}
| aphelion = {{Convert|19.715|AU|Tm|abbr=on|lk=on}}
| eccentricity = 0.19894
| inclination = 20.745°
| asc_node = 337.728°
| arg_peri = 153.374°
| mean_anomaly = 318.473°
| avg_speed = 7.26 km/s
| dimensions = a,b,c={{val|127|5}}, {{val|55|4}}, {{val|45|4|u=km}}
| mean_diameter = {{val|187.5|15.5|ul=km}}
{{val|198|u=km}}
{{val|207|30|u=km}}
| mass =
| density =
| surface_grav =
| escape_velocity =
| rotation = 9.1736 ± 0.0002 h
| spectral_type = BR
B–V {{=}} {{val|0.711|0.059}}
V–R {{=}} {{val|0.476|0.046}}
| sidereal_day = {{Convert|9.14|h|d|abbr=on|lk=on}}
| albedo = 0.03–0.05
{{val|0.05|0.019}} {{val|0.065|0.005}}
| single_temperature = ~ 69 K
| mean_motion = {{Deg2DMS|0.014733|sup=ms}} / day
| observation_arc = 24775 days (67.83 yr)
| uncertainty = 0
| moid = {{Convert|12.199|AU|Tm|abbr=on}}
| jupiter_moid = {{Convert|7.873|AU|Tm|abbr=on}}
| tisserand = 3.575
}}
File:Size comparison of Bienor.png (upper left) and Earth]]
54598 Bienor {{IPAc-en|b|aɪ|ˈ|iː|n|ɔːr}} 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 {{convert|198|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. Through the analysis of rotational light curves and stellar occultations, it has been determined that the object has a highly elongated ellipsoidal shape. Its light curve is consistent with surface deformations, regions with significant albedo variations, or even the possible presence of a moon.
References
{{Reflist| refs =
|first1=J. |last1=Stansberry
|first2=W. |last2=Grundy
|first3=M. |last3=Brown
|first4=D. |last4=Cruikshank
|display-authors=3
|editor-first=M. Antonietta
|editor-last= Barucci
|chapter=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope
|title=The Solar System Beyond Neptune
|date=2008
|arxiv=astro-ph/0702538
}}
|type=2020-11-11 last obs
|title=JPL Small-Body Database Browser: 54598 Bienor (2000 QC243)
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Bienor
|publisher=Jet Propulsion Laboratory
|access-date=20 December 2020}}
|first1 = O. R. |last1 = Hainaut
|first2 = H. |last2 = Boehnhardt
|first3 = S. |last3 = Protopapa
|date = October 2012
|title = Colours of minor bodies in the outer solar system. II. A statistical analysis revisited
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...546A.115H
|journal = Astronomy and Astrophysics
|volume = 546
|page = 20
|bibcode = 2012A&A...546A.115H
|doi = 10.1051/0004-6361/201219566
|arxiv = 1209.1896
|s2cid = 54776793
|access-date= 26 September 2019}}
|title=AstDyS (54598) Bienor Ephemerides
|publisher=Department of Mathematics, University of Pisa, Italy
|url=https://newton.spacedys.com/astdys/index.php?pc=1.1.3.0&n=Bienor
|access-date=20 December 2020}}
|title=Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations
|first1=J. M. |last1=Bauer
|first2=T. |last2=Grav
|first3=E. |last3=Blauvelt
|first4=A. K. |last4=Mainzer
|arxiv=1306.1862
|doi=10.1088/0004-637X/773/1/22
|journal=The Astrophysical Journal
|volume=773
|issue=1
|pages=11
|date=August 2013|bibcode=2013ApJ...773...22B |s2cid=51139703 }}
|title = List of Known Trans-Neptunian Objects
|work = Johnston's Archive
|date = 18 August 2020
|last = Johnston |first= Wm. Robert
|url = http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate = 12 August 2021}}
}}
External links
- {{AstDys|54598}}
- {{JPL small body}}
- [https://archive.stsci.edu/cgi-bin/dss_search?v=poss1_blue&r=03+58+13.09&d=%2B42+42+53.2&e=J2000&h=5.0&w=5.0&f=gif&c=none&fov=NONE&v3= 1953 precovery image] by the Palomar Observatory Sky Survey (Bienor is the object at the centre).
{{Minor planets navigator| |number=54598| }}
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Category:Centaurs (small Solar System bodies)
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