1510 Charlois

1510 Charlois, provisional designation 1939 DC, is a carbonaceous Eunomia asteroid from the middle region of the asteroid belt, approximately 24 kilometers in diameter.

1510 Charlois
001510-asteroid shape model (1510) Charlois.png
Shape model of Charlois from its lightcurve
Discovery [1]
Discovered byA. Patry
Discovery siteNice Obs.
Discovery date22 February 1939
(1510) Charlois
Named after
Auguste Charlois (astronomer)[2]
1939 DC · 1959 WE
1963 UB
main-belt · Eunomia[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc78.10 yr (28,525 days)
Aphelion3.0649 AU
Perihelion2.2791 AU
2.6720 AU
4.37 yr (1,595 days)
0° 13m 32.52s / day
Physical characteristics
Dimensions20.30±0.39 km[4]
23.68 km (derived)[3]
23.80±2.8 km (IRAS:11)[5]
26.98±0.64 km[7]
27.608±0.373 km[8]
5.866±0.0003 h[9]
6.653±0.008 h[10]
0.0791 (derived)[3]
0.1033±0.029 (IRAS:11)[5]
SMASS = C[1] · C[3][11]
11.2[7][8] · 11.40[4] · 11.5[1][3]

It was discovered on 22 February 1939, by French astronomer André Patry at Nice Observatory in southeastern France, and later named after astronomer Auguste Charlois.[2][12]

Orbit and classificationEdit

Charlois is a carbonaceous C-type asteroid and a member of the Eunomia family, a large group of otherwise mostly S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun in the central main-belt at a distance of 2.3–3.1 AU once every 4 years and 4 months (1,595 days). Its orbit has an eccentricity of 0.15 and an inclination of 12° with respect to the ecliptic.[1] As no precoveries were taken and no prior identifications were made, the body's observation arc begins with its discovery observation in 1939.[12]

Physical characteristicsEdit

Diameter and albedoEdit

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Charlois measures between 20.3 and 27.6 kilometers in diameter, and its surface has an albedo between 0.077 and 0.12,[4][5][6][7][8] while the Collaborative Asteroid Lightcurve Link derives an albedo of 0.079 and a diameter of 23.7 kilometers based on an absolute magnitude of 11.5.[3]

Rotation periodEdit

In November 2007, a rotational lightcurve, constructed from photometric observations by Crag Bennefeld at the Rick Observatory, gave a rotation period of 6.653±0.008 hours with a brightness variation of 0.23 in magnitude (U=2).[10] Another lightcurve, obtained by French astronomers Pierre Antonini and René Roy in February 2013, gave a period of 5.866±0.0003 hours with an amplitude of 0.18 (U=2).[9]


This minor planet was named in memory of French astronomer Auguste Charlois (1864–1910), an early discoverer of minor planets at the Nice Observatory where this asteroid was discovered. He was a pioneer during the transition from visual to photographic discoveries in the late 19th century. Until his homicide in 1910, he had discovered 99 asteroids.[2] The official naming citation was published by the Minor Planet Center on 30 June 1977 (M.P.C. 4190).[13]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1510 Charlois (1939 DC)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1510) Charlois". Dictionary of Minor Planet Names – (1510) Charlois. Springer Berlin Heidelberg. p. 120. doi:10.1007/978-3-540-29925-7_1511. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1510) Charlois". Asteroid Lightcurve Database (LCDB). Retrieved 7 August 2016.
  4. ^ a b c d 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 7 August 2016.
  5. ^ 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. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  6. ^ a b c 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. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 9 December 2016.
  7. ^ a b c d 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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 7 August 2016.
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1510) Charlois". Geneva Observatory. Retrieved 7 August 2016.
  10. ^ a b Bennefeld, Craig; Cantu, Jenel; Vashti, Holly; Latoya, Jordon; Tierra, Martin; Soar, Elysabeth; et al. (April 2009). "Asteroid Lightcurve Analysis at Ricky Observatory". The Minor Planet Bulletin. 36 (2): 45–48. Bibcode:2009MPBu...36...45B. Retrieved 7 August 2016.
  11. ^ 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 7 August 2016.
  12. ^ a b "1510 Charlois (1939 DC)". Minor Planet Center. Retrieved 7 August 2016.
  13. ^ Schmadel, Lutz D. (2009). "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.

External linksEdit