1865 Cerberus
{{Short description|Asteroid}}
{{distinguish|Kerberos (moon)}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1865 Cerberus
| background = #FFC2E0
| image = 1865Cerberus (Lightcurve Inversion).png
| image_scale =
| caption = {{longitem|Lightcurve-based 3D-model of Cerberus|style=padding: 5px 0; line-height: 1.3em;}}
| discovered = 26 October 1971
| discoverer = L. Kohoutek
| discovery_site = Bergedorf Obs.
| mpc_name = (1865) Cerberus
| alt_names = 1971 UA
| named_after = Cerberus {{small|(Greek mythology)}}
| pronounced = {{IPAc-en|ˈ|s|ɜr|b|ər|ə|s}}
| adjectives = Cerberean, -ian {{IPAc-en|s|ɜr|'|b|ɪər|i|ə|n}}R.W. Chapman (1939) Adjectives from Proper Names, Clarendon Press, Oxford, p. 56{{OED|Cerberean}}
| mp_category = NEO{{·}}Apollo
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 45.05 yr (16,456 days)
| aphelion = 1.5844 AU
| perihelion = 0.5757 AU
| semimajor = 1.0801 AU
| eccentricity = 0.4669
| period = 1.12 yr (410 days)
| mean_anomaly = 205.19°
| mean_motion = {{Deg2DMS|0.8781|sup=ms}} / day
| inclination = 16.095°
| asc_node = 212.93°
| arg_peri = 325.26°
| moid = 0.1567 AU{{·}}61 LD
| dimensions = 1.2 km {{small|(Gehrels)}}
{{val|1.608|}} km
1.61 km {{small|(taken)}}
{{val|1.611|0.013}} km
| rotation = {{val|6.800|0.006}} h
{{val|6.80328|0.00001}} h
{{val|6.803286|0.000005}} h
{{val|6.8039|}} h{{refn|name=LCDB-Pravec-2008}}
{{val|6.804|0.003}} h
{{val|6.81|}} h{{refn|name=LCDB-Pravec-1999}}
{{val|6.810|0.003}} h
{{val|6.87|}} h
| albedo = {{val|0.1118|}}
{{val|0.136|0.021}}
0.22
{{val|0.50|0.29}}
| spectral_type = {{nowrap|S {{small|(Tholen)}}{{·}}S {{small|(SMASS)}}}}
S
B–V = 0.790
U–B = 0.442
| abs_magnitude = {{val|16.45|0.07}} {{small|(R)}}{{refn|name=LCDB-Pravec-2008}}
16.84
{{val|16.965|0.04}}
{{val|16.97|0.04}}
{{val|16.97|0.13}}
}}
1865 Cerberus is a stony asteroid and near-Earth object of the Apollo group, approximately 1.6 kilometers in diameter. It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at the Hamburger Bergedorf Observatory, Germany, and given the provisional designation {{mp|1971 UA}}. It was named for Cerberus from Greek mythology.
Orbit and classification
Cerberus orbits the Sun at a distance of 0.6–1.6 AU once every 1 years and 1 month (410 days). Its orbit has an eccentricity of 0.47 and an inclination of 16° with respect to the ecliptic.
The Apollo asteroid has an Earth minimum orbital intersection distance of {{convert |0.1567 |AU |km |abbr=on |sigfig=3}}, which corresponds to 61 lunar distances. It passes within 30 gigametres (Gm) of the Earth 7 times from the year 1900 to the year 2100, each time at a distance of 24.4 Gm to 25.7 Gm. It also makes close approaches to Mars and Venus.
Physical characteristics
In the Tholen and SMASS taxonomy, Cerberus is a common stony S-type asteroid, composed of 65% plagioclase and 35% pyroxene. It has a rotation period of 6.804 hours and a geometric albedo of 0.220. With a maximum lightcurve range of 2.3,{{refn|name=LCDB-Pravec-2008}} Cerberus may be cigar shaped like 1I/{{okina}}Oumuamua.
Naming
This minor planet is named after the figure from Greek mythology, Cerberus, a three-headed dog that guarded the entrance to Hades, the Underworld. His capture marked the last of the twelve labors of Hercules. It is also the name of an extinct constellation, Cerberus, now contained in the eastern part of Hercules. (It should not be confused with Kerberos, a moon of the dwarf planet Pluto.) The official {{MoMP|1865|naming citation}} was published by the Minor Planet Center on 20 December 1974 ({{small|M.P.C. 3758}}).
References
{{reflist|refs=
{{refn|name=LCDB-Pravec-1999|1=Detail: "Pravec1999web" at LCDB Data for (1865) Cerberus}}
{{refn|name=LCDB-Pravec-2008|1=Detail: "Pravec2008web" at LCDB Data for (1865) Cerberus}}
|type = 2016-11-14 last obs.
|title = JPL Small-Body Database Browser: 1865 Cerberus (1971 UA)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001865
|publisher = Jet Propulsion Laboratory
|accessdate = 9 June 2017}}
|title = Dictionary of Minor Planet Names – (1865) Cerberus
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|pages = 149–150
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1866 |chapter = (1865) Cerberus }}
|title = 1865 Cerberus (1971 UA)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1865
|accessdate = 12 December 2016}}
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|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
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|title = LCDB Data for (1865) Cerberus
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1865%7CCerberus
|accessdate = 12 December 2016}}
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External links
- [http://www.astrosurf.com/macombes/partie_NEO.html Les NEO (Near-Earth Objects)], Michel-Alain Combes, (in French)
- [http://www.astrosurf.com/macombes/noms_NEA.xls Astrosurf, names of NEAs] Les Noms des NEA – liste alphabétique (Excel spreadsheet in French)
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- {{NeoDys|1865}}
- {{ESA-SSA|1865|Cerberus}}
- {{JPL small body}}
{{Minor planets navigator |1864 Daedalus |number=1865 |1866 Sisyphus}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Cerberus}}