5023 Agapenor

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5023 Agapenor
Discovery [1]
Discovered by C. Shoemaker
E. Shoemaker
Discovery site Palomar Obs.
Discovery date 11 October 1985
MPC designation (5023) Agapenor
Named after
(Greek mythology)[2]
1985 TG3
Jupiter trojan[3][4]
(Greek camp)[5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 31.72 yr (11,585 days)
Aphelion 5.4430 AU
Perihelion 4.9085 AU
5.1758 AU
Eccentricity 0.0516
11.78 yr (4,301 days)
0° 5m 1.32s / day
Inclination 11.777°
Jupiter MOID 0.0440 AU
TJupiter 2.9550
Physical characteristics
Dimensions 27.850±3.511 km[6][7]
46.30 km (calculated)[4]
5.4020±0.0017 h[8]
0.057 (assumed)[4]
X[9] · C[4]
10.3[6] · 10.4[1][4] · 10.88±0.13[9]

5023 Agapenor, provisional designation 1985 TG3, is a Jupiter trojan from the Greek camp, approximately 30 kilometers in diameter. It was discovered on 11 October 1985, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States.[3] The Jovian asteroid was named for Agapenor from Greek mythology.

Orbit and classification[edit]

Agapenor orbits in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy). It orbits the Sun in the outer main-belt at a distance of 4.9–5.4 AU once every 11 years and 9 months (4,301 days). Its orbit has an eccentricity of 0.05 and an inclination of 12° with respect to the ecliptic.[1]

A precovery was taken at the discovering observatory in September 1985, extending the body's observation arc by 25 days prior to its official discovery observation.[3]

Physical characteristics[edit]

Agapenor has been characterized as a X-type asteroid by PanSTARRS photometric survey.[9]

Rotation period[edit]

In September 2009, Agapenor was observed by Italian astronomer Stefano Mottola in a photometric survey of 80 Jupiter trojans, using the 1.2-meter reflector at Calar Alto Observatory in southeastern Spain. The obtained lightcurve gave a rotation period of 5.4020 hours with a brightness variation of 0.12 in magnitude (U=2+).[8]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Agapenor measures 27.9 kilometers in diameter and its surface has an albedo of 0.17.[6][7]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous of 0.057 and calculates a significantly larger diameter of 46.3 kilometers.[4]


This minor planet was named from Greek mythology after Agapenor. He was the leader of the Greek contingent of Arcadians in the Trojan War. The minor planet 1020 Arcadia is named after this able group of warriors. Agapenor was the commander of 60 ships lend to him by Agamemnon, the king of Mycenae and leader of the Greeks in the Trojan War. 911 Agamemnon, one of the largest Jupiter trojans known to exist, is named after the commander of the Greek forces.[2] The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25443).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 5023 Agapenor (1985 TG3)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2017. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5023) Agapenor. Springer Berlin Heidelberg. p. 432. ISBN 978-3-540-00238-3. Retrieved 16 April 2016. 
  3. ^ a b c "5023 Agapenor (1985 TG3)". Minor Planet Center. Retrieved 16 April 2016. 
  4. ^ a b c d e f "LCDB Data for (5023) Agapenor". Asteroid Lightcurve Database (LCDB). Retrieved 16 April 2016. 
  5. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 4 December 2016. 
  6. ^ 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 18 May 2016. 
  7. ^ a b c 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. 
  8. ^ a b 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 18 May 2016. 
  9. ^ 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 18 May 2016. 
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 May 2016. 

External links[edit]