3793 Leonteus

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3793 Leonteus
Discovery [1]
Discovered by C. Shoemaker
E. Shoemaker[a]
Discovery site Palomar Obs.
Discovery date 11 October 1985
MPC designation (3793) Leonteus
Pronunciation /lˈɒntiəs/ lay-ON-tee-əs
Named after
(Greek mythology)[2]
1985 TE3 · 1951 WT1
1961 TB · 1973 UJ3
1978 GO · 1980 KX1
1986 XO
Jupiter trojan[3]
(Greek camp)[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 55.67 yr (20,332 days)
Aphelion 5.6800 AU
Perihelion 4.7490 AU
5.2145 AU
Eccentricity 0.0893
11.91 yr (4,349 days)
0° 4m 58.08s / day
Inclination 20.902°
Jupiter MOID 0.1262 AU
Jupiter Tisserand parameter 2.8610
Physical characteristics
Dimensions 86.26±7.9 km (IRAS:14)[1]
86.38 km (derived)[3]
87.58±2.53 km[5]
112.046±1.846 km[6][7]
5.608±0.01 h[8]
5.618±0.002 h[9]
5.6225±0.0005 h[9]
11.22±0.01 h[10]
0.0717±0.015 (IRAS:14)[1]
0.0784 (derived)[3]
8.7[1][3] · 8.8[5][7]

3793 Leonteus (/lˈɒntiəs/ lay-ON-tee-əs), provisional designation 1985 TE3, is a carbonaceous Jupiter trojan from the Greek camp, approximately 86 kilometers in diameter. It was discovered on 11 October 1985, by American astronomer couple Carolyn and Eugene Shoemaker[a] at Palomar Observatory in California, United States.[11] The Jovian asteroid was named after Leonteus from Greek mythology.[2]

Orbit and classification[edit]

Leonteus is orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy). It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 11 months (4,349 days). Its orbit has an eccentricity of 0.09 and an inclination of 21° with respect to the ecliptic.[1]

The first used precovery was taken at Goethe Link Observatory in 1961, extending the asteroid's observation arc by 24 years prior to its discovery, while the first unused observation at McDonald Observatory dates back to 1951.[11]

Physical characteristics[edit]

Leonteus has been characterized as a C-type asteroid.[3]

Rotation period[edit]

Several photometric lightcurve observations have been performed. The best rated analysis by Stefano Mottola and Anders Erikson using the Dutch 0.9-metre Telescope at La Silla, Chile, in June 1994. The lightcurve gave a rotation period of 5.6225±0.0005 hours with a brightness variation of 0.24±0.01 magnitude (U=2+).[9]

Other analysis gave similar results.[9][8] In addition, an ambiguous lightcurve by Robert Stevens at the U.S. Center for Solar System Studies (CS3), California, also rendered an alternative solution of 11.22±0.01 hours, or twice a long as all other periods measured (U=2).[10]

Diameter and albedo[edit]

According to the space-based surveys carried out by the Infrared Astronomical Satellite, IRAS, and the Japanese Akari satellite, the asteroid measures 86.3 and 87.6 kilometers in diameter and its surface has an albedo of 0.072 of 0.070, respectively.[1][5] NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, however, finds a lower albedo of 0.042 and hence a much larger diameter of 112.1 kilometers.[7]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0784 and a diameter of 86.4 kilometer, in line with the 14 observations made by IRAS.[3]


This minor planet was named from Greek mythology after Leonteus, a hero of the Trojan War, who attempted to win a competition among the Greek warriors to see who could throw an iron meteorite the farthest. However, he lost the game to his associate, Polypoites, after whom the minor planet 3709 Polypoites is named.[2] The official naming citation was published by the Minor Planet Center on 27 August 1988 (M.P.C. 13482).[12]


  1. ^ a b American astronomer Eugene Shoemaker, husband of Carolyn S. Shoemaker, is not credited with the discovery of this Trojan asteroid by the Minor Planet Center (MPC). He is, however, credited as a discoverer in the DISCOVERY.DB used on JPL's Small-Body Database Browser, which was last updated on 29 August 2003.


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 3793 Leonteus (1985 TE3)" (2017-06-04 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3793) Leonteus. Springer Berlin Heidelberg. p. 321. ISBN 978-3-540-00238-3. Retrieved 24 May 2016. 
  3. ^ a b c d e f g "LCDB Data for (3793) Leonteus". Asteroid Lightcurve Database (LCDB). Retrieved 24 May 2016. 
  4. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 4 December 2016. 
  5. ^ 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 24 May 2016. 
  6. ^ a b Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 5 December 2016. 
  7. ^ 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 24 May 2016. 
  8. ^ a b Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091. Retrieved 24 May 2016. 
  9. ^ a b c d Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Retrieved 24 May 2016. 
  10. ^ a b Stephens, Robert D. (April 2010). "Trojan Asteroids Observed from GMARS and Santana Observatories: 2009 October - December". The Minor Planet Bulletin. 37 (2): 47–48. Bibcode:2010MPBu...37...47S. ISSN 1052-8091. Retrieved 24 May 2016. 
  11. ^ a b "3793 Leonteus (1985 TE3)". Minor Planet Center. Retrieved 24 May 2016. 
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 May 2016. 

External links[edit]