5023 Agapenor

5023 Agapenor
Discovery [1]
Discovered by C. Shoemaker
E. Shoemaker
Discovery site Palomar Obs.
Discovery date 11 October 1985
Designations
MPC designation 5023 Agapenor
Named after
 Agapenor
(Greek mythology)[2]
1985 TG3
Jupiter trojan [3][4]
(Greek camp)
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 30.48 yr (11,133 days)
Aphelion 5.4417 AU
Perihelion 4.9171 AU
5.1794 AU
Eccentricity 0.0506
11.79 yr (4,305 days)
176.47°
0° 5m 0.96s / day
Inclination 11.773°
308.40°
84.854°
Jupiter MOID 0.0478 AU
Jupiter Tisserand parameter 2.956
Physical characteristics
Dimensions 27.85±3.51 km[5]
46.30 km (calculated)[4]
5.4020±0.0017 h[6]
0.173±0.093[5]
0.057 (assumed)[4]
C [4]
10.4[1][4]
10.3[5]
10.88±0.13[7]

    5023 Agapenor, provisional designation 1985 TG3, is an asteroid, classified as a Jupiter trojan from the Greek camp, which measures between 25 and 50 kilometers in diameter. It was discovered by American astronomer couple Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory, California, on 11 October 1985.[3]

    The asteroid 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 4.9–5.4 AU once every 11 years and 9 months (4,305 days) with an eccentricity of 0.05 and an inclination of 12° in respect of the ecliptic.[1]

    In September 2009, the body was observed in a photometric light-curve survey of 80 Jupiter trojans, which rendered a rotation period of 5.4020±0.0017 hours with a brightness variation of 0.12±0.01 in magnitude (U=2+).[6]

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the asteroid measures 27.9 kilometers in diameter and its surface has an albedo of 0.17.[5] The body has a X-type spectrum based on a large-scale survey performed by Pan-STARRS,[7] while the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceous C-type with a much lower albedo of 0.057. As a consequence, CALL calculates a diameter of 46.3 kilometers, much larger than determined by WISE.[4]

    The 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 the king of Mycenae and leader of the Greeks in the Trojan War, Agamemnon, after whom 911 Agamemnon, one of the largest Jupiter trojans known to exist, is named.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 5023 Agapenor (1985 TG3)" (2016-03-10 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5023) Agapenor. Springer Berlin Heidelberg. p. 432. ISBN 978-3-540-00238-3. Retrieved April 2016.
    3. 1 2 "5023 Agapenor (1985 TG3)". Minor Planet Center. Retrieved April 2016.
    4. 1 2 3 4 5 6 "LCDB Data for (5023) Agapenor". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    5. 1 2 3 4 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved April 2016.
    6. 1 2 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 April 2016.
    7. 1 2 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved April 2016.

    External links


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