2542 Calpurnia

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2542 Calpurnia
Discovery [1]
Discovered by E. Bowell
Discovery site Anderson Mesa Stn.
Discovery date 11 February 1980
MPC designation (2542) Calpurnia
Named after
Calpurnia (Julius Caesar's wife)[2]
1980 CF · 1972 XN2
1976 OE
main-belt · (outer)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 62.57 yr (22,854 days)
Aphelion 3.3624 AU
Perihelion 2.8997 AU
3.1311 AU
Eccentricity 0.0739
5.54 yr (2,024 days)
0° 10m 40.44s / day
Inclination 4.6207°
Physical characteristics
Dimensions 20.854±0.281 km[3]
27.6±2.3 km[4]

2542 Calpurnia, provisionally designated 1980 CF, is an asteroid from the outer regions of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 11 February 1980, by American astronomer Edward Bowell at Anderson Mesa Station, Flagstaff, United States.[5] The asteroid was named after Julius Caesar's wife, Calpurnia.[2]

Orbit and characterization[edit]

Calpurnia orbits the Sun 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.[5]

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.[4][3] It has an absolute magnitude of 11.6.[1]

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][6]


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).[7]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 2542 Calpurnia (1980 CF)" (2017-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 18 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2542) Calpurnia. Springer Berlin Heidelberg. p. 208. ISBN 978-3-540-00238-3. Retrieved 18 June 2017. 
  3. ^ a b c 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. Bibcode:2011ApJ...741...68M. arXiv:1109.4096Freely accessible. doi:10.1088/0004-637X/741/2/68. Retrieved 18 June 2017. 
  4. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 8 December 2016. 
  5. ^ a b "2542 Calpurnia (1980 CF)". Minor Planet Center. Retrieved 18 June 2017. 
  6. ^ "LCDB Data for (2542) Calpurnia". Asteroid Lightcurve Database (LCDB). Retrieved 18 June 2017. 
  7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 June 2017. 

External links[edit]