Astronomy:1220 Crocus
_Crocus.png) Shape model of Crocus from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 11 February 1932 |
| Designations | |
| (1220) Crocus | |
| Pronunciation | /ˈkroʊkəs/[4] |
| Named after | Crocus[2] |
| 1932 CU · 1955 PC | |
| Minor planet category | main-belt · Eos[3] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.31 yr (31,161 days) |
| |{{{apsis}}}|helion}} | 3.2243 AU |
| |{{{apsis}}}|helion}} | 2.7807 AU |
| 3.0025 AU | |
| Eccentricity | 0.0739 |
| Orbital period | 5.20 yr (1,900 days) |
| Mean anomaly | 204.16° |
| Mean motion | 0° 11m 21.84s / day |
| Inclination | 11.365° |
| Longitude of ascending node | 113.34° |
| 333.41° | |
| Physical characteristics | |
| Dimensions | 17.866±0.175[5] |
| Rotation period | 491.4±0.1[6] |
| Geometric albedo | 0.114±0.020[5] |
| S[3] | |
| Absolute magnitude (H) | 11.72[1] |
1220 Crocus, provisionally designated 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.[7]
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.[1] A
Physical characteristics
The asteroid has been characterized as a stony S-type asteroid.[3]
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 ({{{1}}}).[6]
Naming
This minor planet was later named after the genus of flowering plants, Crocus, in the iris family.[2]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1220 Crocus (1932 CU)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001220.
- ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(1220) Crocus". Dictionary of Minor Planet Names – (1220) Crocus. Springer Berlin Heidelberg. p. 102. doi:10.1007/978-3-540-29925-7_1221. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 "LCDB Data for (1220) Crocus". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1220%7CCrocus.
- ↑ crocus (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=crocus (Subscription or UK public library membership required.)
- ↑ 5.0 5.1 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 15 June 2017.
- ↑ 6.0 6.1 Pilcher, Frederick; Benishek, Vladimir; Franco, Lorenzo; Harris, A. W.; Klinglesmith, Daniel A. III; Hanowell, Jesse et al. (July 2015). "Rotation Period Determination for 1220 Crocus". The Minor Planet Bulletin 42 (3): 155–157. ISSN 1052-8091. Bibcode: 2015MPBu...42..155P. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..155P. Retrieved 15 June 2017.
- ↑ "1220 Crocus (1932 CU)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1220.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1220 Crocus at AstDyS-2, Asteroids—Dynamic Site
- 1220 Crocus at the JPL Small-Body Database
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