Astronomy:2542 Calpurnia
| Discovery [1] | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 11 February 1980 |
| Designations | |
| (2542) Calpurnia | |
| Pronunciation | /kælˈpɜːrniə/[3] |
| Named after | Calpurnia (Julius Caesar's wife)[2] |
| 1980 CF · 1972 XN2 1976 OE | |
| Minor planet category | main-belt · (outer) |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 62.57 yr (22,854 days) |
| |{{{apsis}}}|helion}} | 3.3624 AU |
| |{{{apsis}}}|helion}} | 2.8997 AU |
| 3.1311 AU | |
| Eccentricity | 0.0739 |
| Orbital period | 5.54 yr (2,024 days) |
| Mean anomaly | 248.88° |
| Mean motion | 0° 10m 40.44s / day |
| Inclination | 4.6207° |
| Longitude of ascending node | 145.71° |
| 47.930° | |
| Physical characteristics | |
| Dimensions | 18±1 km[4] 20.854±0.281 km[5] 27.6±2.3 km[6] |
| Geometric albedo | 0.0639±0.012[6] 0.102±0.007[5] 0.15±0.02[4] |
| C [7] | |
| Absolute magnitude (H) | 11.6[1] |
2542 Calpurnia, provisionally designated 1980 CF, is a carbonaceous high-albedo asteroid from the outer regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 11 February 1980, by American astronomer Edward Bowell at Anderson Mesa Station, Flagstaff, United States.[8] The asteroid was named after Julius Caesar's wife, Calpurnia.[2]
Orbit and classification
Calpurnia orbits the Sun in the outer main-belt at a distance of 2.9–3.4 AU once every 5 years and 6 months (2,024 days). Its orbit has an eccentricity of 0.07 and an inclination of 5° with respect to the ecliptic.[1] In 1954, a first precovery was taken at the Palomar Observatory in California, extending the body's observation arc by 26 prior to its official discovery observation at Anderson Mesa.[8]
Physical characterization
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Calpurnia measures 27.6 and 20.854 kilometers in diameter, and its surface has an albedo of 0.0639 and 0.102, respectively.[6][5] It has an absolute magnitude of 11.6.[1]
Near-infrared spectroscopic observations, however, gave a higher albedo of 0.15 with a subsequently shorter diameter of 18 kilometers. Calpurnia has a featureless surface with up to 60% amorphous magnesium pyroxenes that might explain the high albedo for an carbonaceous outer-belt asteroid.[4]
Lightcurve
As of 2017, no rotational lightcurve has been obtained. The body's spectral type, as well as its rotation period and shape remain unknown.[1][9]
Naming
This minor planet was named after Calpurnia, the last wife of Julius Caesar.[2] The approved naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6834).[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: 2542 Calpurnia (1980 CF)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002542.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(2542) Calpurnia". Dictionary of Minor Planet Names – (2542) Calpurnia. Springer Berlin Heidelberg. p. 208. doi:10.1007/978-3-540-29925-7_2543. ISBN 978-3-540-00238-3.
- ↑ "Calpurnia". Dictionary.com Unabridged. Random House. https://www.dictionary.com/browse/Calpurnia.
- ↑ 4.0 4.1 4.2 Kasuga, Toshihiro; Usui, Fumihiko; Shirahata, Mai; Kuroda, Daisuke; Ootsubo, Takafumi; Okamura, Natsuko et al. (February 2015). "Near-Infrared Spectra of High-Albedo Outer Main-Belt Asteroids". The Astronomical Journal 149 (2): 8. doi:10.1088/0004-6256/149/2/37. 37. Bibcode: 2015AJ....149...37K.
- ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 18 June 2017.
- ↑ 6.0 6.1 6.2 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019.
- ↑ Hasselmann, P. H.; Carvano, J. M.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics 510: 12. doi:10.1051/0004-6361/200913322. Bibcode: 2010A&A...510A..43C. https://sbn.psi.edu/pds/resource/sdsstax.html. Retrieved 8 August 2017.
- ↑ 8.0 8.1 "2542 Calpurnia (1980 CF)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2542.
- ↑ "LCDB Data for (2542) Calpurnia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2542%7CCalpurnia.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
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
- 2542 Calpurnia at AstDyS-2, Asteroids—Dynamic Site
- 2542 Calpurnia at the JPL Small-Body Database
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