1873 Agenor

From Wikipedia, the free encyclopedia
Jump to: navigation, search
1873 Agenor
Discovery [1]
Discovered by T. Gehrels
C. J. van Houten
I. van Houten-Groeneveld
Discovery site Palomar Obs.
Discovery date 25 March 1971
MPC designation 1873 Agenor
Named after
(Greek mythology)[2]
1971 FH
Jupiter trojan[1][3]
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 44.93 yr (16410 days)
Aphelion 5.7195 AU (855.63 Gm)
Perihelion 4.7535 AU (711.11 Gm)
5.2365 AU (783.37 Gm)
Eccentricity 0.092237
11.98 yr (4376.85 d)
0° 4m 56.104s / day
Inclination 21.879°
Earth MOID 3.75247 AU (561.362 Gm)
Jupiter MOID 0.698712 AU (104.5258 Gm)
Jupiter Tisserand parameter 2.848
Physical characteristics
Dimensions 53.76 km
54.38±1.62 km[4]
50.80±1.18 km[5]
53.94 km (derived)[3]
Mean radius
26.88 ± 2.2 km
20.60 h (0.858 d)[1][6]
0.0554 (derived)[3]
0.0386 ± 0.007[1]

1873 Agenor, provisional designation 1971 FH, is a dark Jupiter trojan, approximately 54 kilometers in diameter. It was discovered on March 25, 1971 by Cornelis van Houten and I. van Houten-Groeneveld at Leiden, on photographic plates taken by Tom Gehrels at the U.S. Palomar Observatory in the Palomar Mountain Range, southeast of Los Angeles.[7]

The Trojan asteroid dwells in the L5 Lagrangian point, 60 degrees behind Jupiter in the so-called "Trojan camp". It orbits the Sun at a distance of 4.8–5.7 AU once every 12 years (4,378 days). In 1994, photometric observations were used to build a light-curve showing a rotation period of 20.60±0.03 hours with a brightness variation of 0.08±0.01 in magnitude.[6] The C-type asteroid has an albedo between 0.03 and 0.07, as measured by the Akari and WISE/NEOWISE missions.[4][5]

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.

It was named after the Trojan warrior Agenor, who fought and wounded Achilles. The Olympian deity Apollo assumed his form in order to lead Achilles away from the retreating Trojans. The minor planets 588 Achilles and 1862 Apollo are named after these two figures of Greek mythology.[2]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1873 Agenor (1971 FH)" (2015-10-23 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2016. 
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1873) Agenor. Springer Berlin Heidelberg. p. 150. ISBN 978-3-540-29925-7. Retrieved 8 November 2015. 
  3. ^ a b c d "LCDB Data for (1873) Agenor". Asteroid Lightcurve Database (LCDB). Retrieved 8 November 2015. 
  4. ^ a b c 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 8 November 2015. 
  5. ^ a b c 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:1109.6407free to read. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 8 November 2015. 
  6. ^ 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 8 November 2015. 
  7. ^ "1873 Agenor (1971 FH)". Minor Planet Center. Retrieved 8 November 2015. 

External links[edit]