Astronomy:5023 Agapenor

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5023 Agapenor
Discovery [1]
Discovered byC. Shoemaker
E. Shoemaker
Discovery sitePalomar Obs.
Discovery date11 October 1985
Designations
(5023) Agapenor
Pronunciation/æɡəˈpiːnɔːr/[6]
Named afterAgapenor
(Greek mythology)[2]
1985 TG3
Minor planet categoryJupiter trojan [3][4]
(Greek camp)[5]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc31.72 yr (11,585 days)
|{{{apsis}}}|helion}}5.4430 AU
|{{{apsis}}}|helion}}4.9085 AU
5.1758 AU
Eccentricity0.0516
Orbital period11.78 yr (4,301 days)
Mean anomaly227.44°
Mean motion0° 5m 1.32s / day
Inclination11.777°
Longitude of ascending node308.36°
84.242°
Jupiter MOID0.0440 AU
TJupiter2.9550
Physical characteristics
Dimensions27.850±3.511 km[7][8]
46.30 km (calculated)[4]
Rotation period5.4020±0.0017 h[9]
Geometric albedo0.057 (assumed)[4]
0.173±0.093[7][8]
X [10] · C [4]
Absolute magnitude (H)10.3[7] · 10.4[1][4] · 10.88±0.13[10]


5023 Agapenor /æɡəˈpiːnɔːr/ 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

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

Agapenor has been characterized as an X-type asteroid by PanSTARRS photometric survey.[10]

Rotation period

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 ({{{1}}}).[9]

Diameter and albedo

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.[7][8]

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]

Naming

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).[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 5023 Agapenor (1985 TG3)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005023. 
  2. ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(5023) Agapenor". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 432. doi:10.1007/978-3-540-29925-7_4891. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 "5023 Agapenor (1985 TG3)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=5023. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "LCDB Data for (5023) Agapenor". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=5023%7CAgapenor. 
  5. ↑ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html. 
  6. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 18 May 2016. 
  8. ↑ 8.0 8.1 8.2 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. doi:10.1088/0004-637X/759/1/49. Bibcode: 2012ApJ...759...49G. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G. Retrieved 5 December 2016. 
  9. ↑ 9.0 9.1 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. doi:10.1088/0004-6256/141/5/170. Bibcode: 2011AJ....141..170M. 
  10. ↑ 10.0 10.1 10.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 18 May 2016. 
  11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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