1220 Crocus
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1220 Crocus
| background = #D6D6D6
| image = 001220-asteroid shape model (1220) Crocus.png
| image_scale =
| caption = Shape model of Crocus from its lightcurve
| discovered = 11 February 1932
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| mpc_name = (1220) Crocus
| alt_names = 1932 CU{{·}}1955 PC
| pronounced = {{IPAc-en|ˈ|k|r|oʊ|k|ə|s}}{{OED|crocus}}
| named_after = Crocus
| mp_category = main-belt{{·}}Eos
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 85.31 yr (31,161 days)
| aphelion = 3.2243 AU
| perihelion = 2.7807 AU
| semimajor = 3.0025 AU
| eccentricity = 0.0739
| period = 5.20 yr (1,900 days)
| mean_anomaly = 204.16°
| mean_motion = {{Deg2DMS|0.1894|sup=ms}} / day
| inclination = 11.365°
| asc_node = 113.34°
| arg_peri = 333.41°
| dimensions = {{val|17.866|0.175}}
| rotation = {{val|491.4|0.1}}
| albedo = {{val|0.114|0.020}}
| spectral_type = S
}}
1220 Crocus, provisionally designated {{mp|1932 CU}}, is a stony Eoan asteroid and slow rotator from the outer regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 11 February 1932, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany.
Orbit and classification
Crocus is a member of the Eos family, a collisional population of mostly stony composition. It orbits the Sun at a distance of 2.8–3.2 AU once every 5 years and 2 months (1,900 days). Its orbit has an eccentricity of 0.07 and an inclination of 11° with respect to the ecliptic.
A
Physical characteristics
The asteroid has been characterized as a stony S-type asteroid.
In December 2014, a rotational lightcurve of Crocus was obtained from photometric observations by an international collaboration of several astronomers from Europe and the United States. Lightcurve analysis gave a long rotation period of 491 hours with a brightness variation of 1.00 magnitude ({{small|U=3}}).
Naming
This minor planet was later named after the genus of flowering plants, Crocus, in the iris family.
References
{{reflist|30em|refs=
|type = 2017-06-05 last obs.
|title = JPL Small-Body Database Browser: 1220 Crocus (1932 CU)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001220
|archive-url = https://web.archive.org/web/20200918013229/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001220
|archive-date = 18 September 2020
|publisher = Jet Propulsion Laboratory
|access-date = 15 June 2017}}
|title = Dictionary of Minor Planet Names – (1220) Crocus
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 102
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1221 |chapter = (1220) Crocus }}
|title = 1220 Crocus (1932 CU)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1220
|access-date = 15 June 2017}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = T. |last2 = Grav
|first3 = A. K. |last3 = Mainzer
|first4 = C. R. |last4 = Nugent
|first5 = J. M. |last5 = Bauer
|first6 = R. |last6 = Stevenson
|first7 = S. |last7 = Sonnett
|date = August 2014
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M
|journal = The Astrophysical Journal
|volume = 791
|issue = 2
|page = 11
|bibcode = 2014ApJ...791..121M
|doi = 10.1088/0004-637X/791/2/121
|arxiv = 1406.6645
|access-date= 15 June 2017}}
|title = LCDB Data for (1220) Crocus
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1220%7CCrocus
|access-date = 15 June 2017}}
|display-authors = 6
|first1 = Frederick |last1 = Pilcher
|first2 = Vladimir |last2 = Benishek
|first3 = Lorenzo |last3 = Franco
|first4 = A. W. |last4 = Harris
|first5 = Daniel A. III |last5 = Klinglesmith
|first6 = Jesse |last6 = Hanowell
|first7 = Caroline |last7 = Odden
|first8 = Rocco |last8 = Amorosso
|first9 = Thomas |last9 = Jhost
|first10 = Ava |last10 = Larocca
|first11 = Sarp |last11 = Orgul
|first12 = Julia |last12 = Xia
|date = July 2015
|title = Rotation Period Determination for 1220 Crocus
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..155P
|journal = The Minor Planet Bulletin
|volume = 42
|issue = 3
|pages = 155–157
|issn = 1052-8091
|bibcode = 2015MPBu...42..155P
|access-date= 15 June 2017}}
}}
External links
- [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
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1220}}
- {{JPL small body}}
{{Minor planets navigator |1219 Britta |number=1220 |1221 Amor}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Crocus}}