1461 Jean-Jacques

1461 Jean-Jacques, provisional designation 1937 YL, is a metallic asteroid from the outer region of the asteroid belt, approximately 34 kilometers in diameter. It was discovered on 30 December 1937, by French astronomer Marguerite Laugier at Nice Observatory in southern France, who named it after her son Jean-Jacques Laugier.[11]

1461 Jean-Jacques
Discovery [1]
Discovered byM. Laugier
Discovery siteNice Obs.
Discovery date30 December 1937
MPC designation(1461) Jean-Jacques
Named after
Jean-Jacques Laugier
(son of discoverer)[2]
1937 YL · 1935 OH
1939 GH
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc81.92 yr (29,921 days)
Aphelion3.2752 AU
Perihelion2.9749 AU
3.1250 AU
5.52 yr (2,018 days)
0° 10m 42.24s / day
Physical characteristics
Dimensions25.33±1.04 km[4]
32.94±1.4 km (IRAS:8)[5]
33.75±1.40 km[6]
41.431±0.464 km[8]
16.56±0.01 h[9]
0.1613±0.014 (IRAS:8)[5]
Tholen = M [1] · X[10] · M[3]
B–V = 0.715[1]
U–B = 0.210[1]
9.97±0.33[10] · 10.01[1][3][4][5][6][8]

Orbit and classificationEdit

Jean-Jacques orbits the Sun in the outer main-belt at a distance of 3.0–3.3 AU once every 5 years and 6 months (2,018 days). Its orbit has an eccentricity of 0.05 and an inclination of 15° with respect to the ecliptic.[1] The asteroid was first identified as 1935 OH at Johannesburg Observatory in 1935, extending the body's observation arc by 2 years prior to its official discovery observation.[11]

Physical characteristicsEdit

In the Tholen classification, Jean-Jacques is a metallic M-type asteroid.[1]

Rotation periodEdit

In March 2005, a rotational lightcurve of Jean-Jacques was obtained from photometric observations by Laurent Bernasconi and Horacio Correia. Lightcurve analysis gave a rotation period of 16.56 hours with a brightness variation of 0.09 in magnitude (U=2).[9]

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, Jean-Jacques measures between 25.33 and 41.43 kilometers in diameter and its surface has an albedo between 0.102 and 0.273.[5][6][7]

The Collaborative Asteroid Lightcurve Link adopts the results from IRAS, that is an albedo of 0.161 and a diameter of 32.94 kilometers with an absolute magnitude of 10.01.[3]


This minor planet was named after Jean-Jacques Laugier, the son of the discoverer.[2] The official naming citation was published by the Minor Planet Center on 31 January 1962 (M.P.C. 2116).[12]


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1461 Jean-Jacques (1937 YL)" (2017-07-03 last obs.). Jet Propulsion Laboratory. Retrieved 25 July 2017.
  2. ^ a b Schmadel, Lutz D. (2007). "(1461) Jean-Jacques". Dictionary of Minor Planet Names – (1461) Jean-Jacques. Springer Berlin Heidelberg. p. 117. doi:10.1007/978-3-540-29925-7_1462. ISBN 978-3-540-00238-3.
  3. ^ a b c d "LCDB Data for (1461) Jean-Jacques". Asteroid Lightcurve Database (LCDB). Retrieved 16 December 2016.
  4. ^ a b c 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 16 December 2016.
  5. ^ a b c d 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 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)
  7. ^ 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 16 December 2016.
  8. ^ a b c 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.
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1461) Jean-Jacques". Geneva Observatory. Retrieved 16 December 2016.
  10. ^ a b 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 16 December 2016.
  11. ^ a b "1461 Jean-Jacques (1937 YL)". Minor Planet Center. Retrieved 16 December 2016.
  12. ^ 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.

External linksEdit