1622_Chacornac

1622 Chacornac

1622 Chacornac

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1622 Chacornac (provisional designation 1952 EA) is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 15 March 1952, by French astronomer Alfred Schmitt at the Royal Observatory of Belgium in Uccle, and named after astronomer Jean Chacornac.[2][10]

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Orbit and classification

The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,220 days). Its orbit has an eccentricity of 0.16 and an inclination of 6° with respect to the ecliptic.[1] The first precovery was taken at Lowell Observatory in 1930, extending Chacornac's observation arc by 22 years prior to its official discovery observation.[10]

Lightcurves

Between 2009 and 2013, several rotational lightcurves for this asteroid were obtained from photometric observations at the Palomar Transient Factory and the Hunters Hill Observatory, as well as by astronomers Eric Barbotin and Raoul Behrend. Lightcurve analysis gave a rotation period between 11.48 and 12.20 hours with a brightness variation between 0.21 and 0.25 in magnitude (U=2/2/2).[6][7][8]

Diameter and albedo

According to the survey carried out by the Japanese Akari satellite, Chacornac measures 10.3 kilometers in diameter and its surface has an albedo of 0.224,[5] while observations by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission gave a diameter of 8.4 kilometers and a high albedo of 0.36.[4] The Collaborative Asteroid Lightcurve Link agrees with the results obtained by AKARI and assumes an albedo of 0.24 – derived from 8 Flora, the family's largest member and namesake – and calculates a diameter of 9.9 kilometers with an absolute magnitude of 12.2.[3]

Naming

This minor planet was named in memory of French astronomer Jean Chacornac (1823–1873), an early discoverer of minor planets himself, most notably 25 Phocaea. He also discovered the parabolic comet C/1852 K1 (Chacornac) in 1852 and independently discovered 20 Massalia. The lunar crater Chacornac also bears his name.[2] The official naming citation was published by the Minor Planet Center on 1 August 1978 (M.P.C. 4418).[11]

References

  1. [1]
    "JPL Small-Body Database Browser: 1622 Chacornac (1952 EA)" (2016-11-19 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
  2. [2]
    Schmadel, Lutz D. (2007). "(1622) Chacornac". Dictionary of Minor Planet Names – (1622) Chacornac. Springer Berlin Heidelberg. p. 129. doi:10.1007/978-3-540-29925-7_1623. ISBN 978-3-540-00238-3.
  3. [3]
    "LCDB Data for (1622) Chacornac". Asteroid Lightcurve Database (LCDB). Retrieved 1 August 2016.
  4. [4]
    Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 1 August 2016.
  5. [5]
    Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  6. [6]
    Behrend, Raoul. "Asteroids and comets rotation curves – (1622) Chacornac". Geneva Observatory. Retrieved 1 August 2016.
  7. [7]
    Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 1 August 2016.
  8. [8]
    Higgins, David; Warner, Brian D. (October 2009). "Lightcurve Analysis at Hunters Hill Observatory and Collaborating Stations - Autumn 2009". The Minor Planet Bulletin. 36 (4): 159–160. Bibcode:2009MPBu...36..159H. ISSN 1052-8091. Retrieved 1 August 2016.
  9. [9]
    Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 August 2016.
  10. [10]
    "1622 Chacornac (1952 EA)". Minor Planet Center. Retrieved 1 August 2016.
  11. [11]
    Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
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