1873 Agenor

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1873 Agenor
Discovery [1]
Discovered by C. J. van Houten
I. van Houten-G.
T. Gehrels
Discovery site Palomar Obs.
Discovery date 25 March 1971
MPC designation (1873) Agenor
Pronunciation /əˈnɔːr/ ə-JEE-nor
Named after
Agenor (Greek mythology)[2]
1971 FH
Jupiter trojan[1][3]
(Trojan camp)[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 46.00 yr (16,801 days)
Aphelion 5.7165 AU
Perihelion 4.7480 AU
5.2323 AU
Eccentricity 0.0925
11.97 yr (4,372 days)
0° 4m 56.64s / day
Inclination 21.879°
Jupiter MOID 0.7034 AU
TJupiter 2.8480
Physical characteristics
Dimensions 50.799±1.181 km[5]
50.80±1.18 km[6]
53.89 km (derived)[3]
54.38±1.62 km[7]
20.60±0.03 h[8]
0.0554 (derived)[3]
10.1[6] · 10.2[1][3] · 10.23±0.21[9] · 10.50[7]

1873 Agenor (/əˈnɔːr/ ə-JEE-nor), provisional designation 1971 FH, is a dark Jupiter trojan from the Trojan camp, approximately 53 kilometers in diameter. It was discovered during the Palomar–Leiden Trojan survey in 1971, and later named after Agenor from Greek mythology.


Agenor was discovered on 25 March 1971, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at Palomar Observatory in the Palomar Mountain Range, southeast of Los Angeles.[10]

The discovery was made in a survey of faint Trojans, one night after the discovery of 1870 Glaukos. The trio of Dutch and Dutch–American astronomers also collaborated on the productive Palomar–Leiden survey in the 1960s, using the same procedure as for this (smaller) survey: Tom Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis and Ingrid van Houten at Leiden Observatory where astrometry was carried out.

Orbit and classification[edit]

The Trojan asteroid dwells in the L5 Lagrangian point, 60° behind Jupiter in the so-called "Trojan camp". It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 12 months (4,372 days). Its orbit has an eccentricity of 0.09 and an inclination of 22° with respect to the ecliptic.[1] As no precoveries were taken, the body's observation arc begins with its official discovery observation in 1971.[10]

Physical characteristics[edit]

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

Rotation period[edit]

In February 1994, photometric observations with the ESO 1-metre telescope by astronomer Stefano Mottola and Anders Erikson at La Silla Observatory in Chile, were used to build a rotational lightcurve showing a rotation period of 20.60±0.03 hours with a brightness variation of 0.08±0.01 in magnitude (U=2).[8]

Diameter and albedo[edit]

Agenor has an albedo of 0.038 and 0.062, and a diameter of 50.8 and 54.4 kilometers as measured by the space-based Akari and WISE/NEOWISE missions, respectively.[5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.056 and a diameter of 53.9 kilometers.[3]


This minor planet was named for Agenor, who was able to inflict a wound on the Greek warrior Achilles, the Olympian deity Apollo assumed Agenor's form to distract Achilles while the Trojans forces were retreating. The minor planets 588 Achilles and 1862 Apollo are named after these two figures from Greek mythology, the body's name was suggested by Brian G. Marsden, the then director of the MPC.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3826).[11]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1873 Agenor (1971 FH)" (2017-03-24 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2017. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1873) Agenor. Springer Berlin Heidelberg. p. 150. ISBN 978-3-540-00238-3. Retrieved 27 October 2016. 
  3. ^ a b c d e f g "LCDB Data for (1873) Agenor". Asteroid Lightcurve Database (LCDB). Retrieved 27 October 2016. 
  4. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 1 June 2016. 
  5. ^ 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. 
  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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 27 October 2016. 
  7. ^ 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 27 October 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 27 October 2016. 
  9. ^ 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 27 October 2016. 
  10. ^ a b "1873 Agenor (1971 FH)". Minor Planet Center. Retrieved 27 October 2016. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 October 2016. 

External links[edit]