1378 Leonce

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
1378 Leonce
1378Leonce (Lightcurve Inversion).png
Lightcurve-based 3D-model of Leonce
Discovery [1]
Discovered by F. Rigaux
Discovery site Uccle Obs.
Discovery date 21 February 1936
MPC designation (1378) Leonce
Named after
Leonce Rigaux [2]
(discoverer's father)
1936 DB · 1958 FG
1958 GY · 1962 KB
A915 RC · A915 WA
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 101.54 yr (37,088 days)
Aphelion 2.7300 AU
Perihelion 2.0187 AU
2.3743 AU
Eccentricity 0.1498
3.66 yr (1,336 days)
0° 16m 9.84s / day
Inclination 3.5913°
Physical characteristics
Dimensions 14.94±3.81 km[5]
18.16 km (derived)[3]
18.18±1.4 km[6]
20.54±0.13 km[7]
21.228±0.070 km[8]
22.20±0.33 km[9]
22.456±0.170 km[10]
4.3250±0.0002 h[11]
4.325±0.001 h[12]
4.32527±0.00005 h[13]
4.3586±0.0002 h[11]
0.0706 (derived)[3]
C (assumed)[3]
11.94±0.22[14] · 12.10[6][7][9][10] · 12.20[1][3][5]

1378 Leonce, provisional designation 1936 DB, is a dark Nysian asteroid from the inner regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 21 February 1936, by Belgian astronomer Fernand Rigaux at the Royal Observatory of Belgium in Uccle, who named it after his father, Leonce Rigaux.[2][15]

Orbit and classification[edit]

Leonce is a member of the Nysa family (405),[4] also known as the Nysa-Polana complex, the largest grouping of almost 20 thousand known asteroids in the main belt, consisting of several sub-asteroid families.[16]:23

It orbits the Sun in the inner asteroid belt at a distance of 2.0–2.7 AU once every 3 years and 8 months (1,336 days). Its orbit has an eccentricity of 0.15 and an inclination of 4° with respect to the ecliptic.[1]

The asteroid was first identified as 1915 RC at Heidelberg Observatory in September 1915. One week later, the body's observation arc begins at Bergedorf Observatory, more than 20 years prior to its official discovery observation at Uccle.[15]

Physical characteristics[edit]

Leonce is an assumed carbonaceous C-type asteroid.[3]

Rotation period and poles[edit]

In 2002, 2007 and 2017, three rotational lightcurves of Leonce were obtained from photometric observations by amateur astronomers René Roy, Laurent Bernasconi and Daniel Klinglesmith and colleges at Etscorn Observatory (719), respectively. Analysis gave a well-defined lightcurve with a consolidated rotation period of 4.3250 hours and a brightness amplitude between 0.49 and 0.63 magnitude (U=3/3/3).[3][11][12]

In addition a modeled lightcurve, using photometric data from various sources, gave a period of 4.32527 hours, as well as two spin axis of (210.0°, −67.0°) and (46.0°, −77.0°) in ecliptic coordinates.[13]

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, Leonce measures between 14.94 and 22.456 kilometers in diameter and its surface has an albedo between 0.0348 and 0.10.[5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0706 and a diameter of 18.16 kilometers based on an absolute magnitude of 12.2.[3]


This minor planet was named after Leonce Rigaux, father of the discoverer astronomer Fernand Rigaux. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 125).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1378 Leonce (1936 DB)" (2017-03-28 last obs.). Jet Propulsion Laboratory. Retrieved 31 October 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1378) Leonce. Springer Berlin Heidelberg. p. 112. ISBN 978-3-540-00238-3. Retrieved 31 October 2017. 
  3. ^ a b c d e f g h "LCDB Data for (1378) Leonce". Asteroid Lightcurve Database (LCDB). Retrieved 31 October 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 31 October 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 31 October 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 31 October 2017. 
  7. ^ 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 31 October 2017. 
  8. ^ a b 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 31 October 2017. 
  9. ^ 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 31 October 2017. 
  10. ^ 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 31 October 2017. 
  11. ^ a b c Behrend, Raoul. "Asteroids and comets rotation curves – (1378) Leonce". Geneva Observatory. Retrieved 31 October 2017. 
  12. ^ a b Klinglesmith, Daniel A., III; Hanowell, Jesse; Risley, Ethan; Turk, Janek; Vargas, Angelica; Warren, Curtis Alan (October 2013). "Inversion Model Candidates". The Minor Planet Bulletin. 40 (4): 190–193. Bibcode:2013MPBu...40..190K. ISSN 1052-8091. Retrieved 31 October 2017. 
  13. ^ a b Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics. 559: 19. arXiv:1309.4296Freely accessible. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved 31 October 2017. 
  14. ^ 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 31 October 2017. 
  15. ^ a b "1378 Leonce (1936 DB)". Minor Planet Center. Retrieved 31 October 2017. 
  16. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 31 October 2017. 

External links[edit]