1261 Legia

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1261 Legia
Discovery [1]
Discovered by E. Delporte
Discovery site Uccle Obs.
Discovery date 23 March 1933
MPC designation (1261) Legia
Named after
Latin name for Liège[2]
(Belgian city)
1933 FB · 1938 CS
1938 DH · 1944 FD
1966 DG
main-belt · (outer)
Themis[3] · background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 84.28 yr (30,785 days)
Aphelion 3.6992 AU
Perihelion 2.5758 AU
3.1375 AU
Eccentricity 0.1790
5.56 yr (2,030 days)
0° 10m 38.28s / day
Inclination 2.4274°
Physical characteristics
Dimensions 31.20 km (derived)[3]
31.26±11.50 km[5]
31.28±1.3 km[6]
32.13±0.66 km[7]
32.576±0.126 km[8]
35.324±0.345 km[9]
36.56±0.35 km[10]
8.693±0.007 h[11]
0.0601 (derived)[3]
P[9] · S (assumed)[3]
11.00[6][7][9] · 11.10[10] · 11.12±0.72[12] · 11.2[1][3] · 11.29[5]

1261 Legia, provisional designation 1933 FB, is a dark Themistian asteroid from the outer regions of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 23 March 1933, by astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle.[13] The asteroid was named for the Belgian city of Liège (Luke).[2]

Orbit and classification[edit]

Legia is a Themistian asteroid that belongs to the Themis family (602), a very large family of carbonaceous asteroids, named after 24 Themis.[3] It is, however, a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements.[4]

It orbits the Sun in the outer asteroid belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,030 days; semi-major axis of 3.14 AU). Its orbit has an eccentricity of 0.18 and an inclination of 2° with respect to the ecliptic.[1]

The body's observation arc begins at Uccle in March 1933, five days after its official discovery observation.[13]

Physical characteristics[edit]

Legia has been characterized as a primitive and reddish P-type asteroid by the Wide-field Infrared Survey Explorer (WISE).[9]

Rotation period[edit]

In January 2005, a rotational lightcurve of Legia was obtained from photometric observations by French amateur astronomer Laurent Bernasconi. Lightcurve analysis gave a rotation period of 8.693 hours with a brightness amplitude of 0.13 magnitude (U=2+).[11]

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 WISE telescope, Legia measures between 31.26 and 36.56 kilometers in diameter and its surface has an albedo between 0.048 and 0.0719.[5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0601 and a diameter of 31.20 kilometers based on an absolute magnitude of 11.2.[3]


This minor planet was named "Legia", the Latin name of the Belgian city of Liège (Luik). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 116).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1261 Legia (1933 FB)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 28 November 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1261) Legia. Springer Berlin Heidelberg. p. 104. ISBN 978-3-540-00238-3. Retrieved 28 November 2017. 
  3. ^ a b c d e f g "LCDB Data for (1261) Legia". Asteroid Lightcurve Database (LCDB). Retrieved 28 November 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 28 November 2017. 
  5. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 28 November 2017. 
  6. ^ 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. Archived from the original on 2016-06-03. Retrieved 28 November 2017. 
  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 28 November 2017. 
  8. ^ 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" (PDF). The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 28 November 2017. 
  9. ^ a b c d e f 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 28 November 2017. 
  10. ^ 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 28 November 2017. 
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1261) Legia". Geneva Observatory. Retrieved 28 November 2017. 
  12. ^ 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 28 November 2017. 
  13. ^ a b "1261 Legia (1933 FB)". Minor Planet Center. Retrieved 28 November 2017. 

External links[edit]