1006 Lagrangea

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1006 Lagrangea
Discovery [1]
Discovered by S. Belyavskyj
Discovery site Simeiz Obs.
Discovery date 12 September 1923
MPC designation (1006) Lagrangea
Named after
Joseph-Louis Lagrange
(Italian astronomer)[2]
1923 OU
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 93.73 yr (34,235 days)
Aphelion 4.2641 AU
Perihelion 2.0210 AU
3.1425 AU
Eccentricity 0.3569
5.57 yr (2,035 days)
0° 10m 36.84s / day
Inclination 10.917°
Physical characteristics
Dimensions 29.53 km (derived)[3]
29.56±2.3 km[4]
30.36±6.84 km[5]
32.24±1.16 km[6]
35.310±0.345 km[7][8]
32.79±0.06 h[9]
0.0612 (derived)[3]
D[10] · C[3]
11.20[4][6][8] · 11.30[1][3][5] · 11.36±0.19[10]

1006 Lagrangea, provisional designation 1923 OU, is a carbonaceous background asteroid from the outer region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 12 September 1923, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula.[11] The asteroid was named after Italian mathematician and astronomer Joseph-Louis Lagrange.[2]

Orbit and classification[edit]

Lagrangea is not a member of any known asteroid family. It orbits the Sun in the outer main belt at a distance of 2.0–4.3 AU once every 5 years and 7 months (2,035 days). Its orbit has an eccentricity of 0.36 and an inclination of 11° with respect to the ecliptic.[1] The body's observation arc begins at the discovering observatory, 4 days after its official discovery observation.[11]

Physical characteristics[edit]

Lagrangea has been characterized as a dark D-type asteroid by Pan-STARRS photometric survey, while the LCDB assumes a generic, carbonaceous C-type.[3][10]

Rotation period[edit]

In September 2001, a rotational lightcurve of Lagrangea was obtained from photometric observations by French amateur astronomer Laurent Bernasconi. Lightcurve analysis gave a longer-than-average rotation period of 32.79 hours with a brightness amplitude of 0.17 magnitude.[9] As the lightcurve has received a low quality rating, the obtained period must be considered tentative (U=1).[3]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Lagrangea measures between 29.56 and 35.31 kilometers in diameter and its surface has an albedo between 0.046 and 0.067.[4][5][6][7][8]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0612 and a diameter of 29.53 kilometers based on an absolute magnitude of 11.3.[3]


This minor planet was named after Italian mathematician Joseph-Louis Lagrange (1736–1813), who made significant contributions to astronomy, in particular celestial mechanics. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 96). The Lagrangian point are named after him. He is also honored by the lunar crater Lagrange.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1006 Lagrangea (1923 OU)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 29 August 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1006) Lagrangea. Springer Berlin Heidelberg. p. 87. ISBN 978-3-540-00238-3. Retrieved 29 August 2017. 
  3. ^ a b c d e f g h "LCDB Data for (1006) Lagrangea". Asteroid Lightcurve Database (LCDB). Retrieved 29 August 2017. 
  4. ^ 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. Bibcode:2004PDSS...12.....T. Retrieved 29 August 2017. 
  5. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 29 August 2017. 
  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 29 August 2017. 
  7. ^ 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. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 29 August 2017. 
  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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 29 August 2017. 
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1006) Lagrangea". Geneva Observatory. Retrieved 29 August 2017. 
  10. ^ a b c 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 29 August 2017. 
  11. ^ a b "1006 Lagrangea (1923 OU)". Minor Planet Center. Retrieved 29 August 2017. 

External links[edit]