5264 Telephus

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5264 Telephus
Discovery [1]
Discovered by C. Shoemaker
E. Shoemaker
Discovery site Palomar Obs.
Discovery date 17 May 1991
MPC designation 5264 Telephus
Pronunciation ˈtɛlᵻfəs (tel'-ə-fəs)
Named after
(Greek mythology)[2]
1991 KC · 1965 AO
Jupiter trojan[3][4]
(Greek camp)[5]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 51.62 yr (18,854 days)
Aphelion 5.7857 AU
Perihelion 4.6300 AU
5.2079 AU
Eccentricity 0.1110
11.88 yr (4,341 days)
0° 4m 58.44s / day
Inclination 33.577°
Jupiter MOID 0.6417 AU
Jupiter Tisserand parameter 2.6560
Physical characteristics
Dimensions 68.472±1.191[6][7]
73.26±5.0 km (IRAS:3)[1]
73.41 km (derived)[4]
81.38±4.78 km[8]
9.518±0.013 h[9]
9.540±0.007 h[10]
0.0522±0.008 (IRAS:3)[1]
0.0624 (derived)[4]
9.3[1][4][6] · 9.50[8]

5264 Telephus (tel'-Ə-fəs), provisional designation 1991 KC, is a carbonaceous Jupiter trojan from the Greek camp, approximately 73 kilometers in diameter. It was discovered on 17 May 1991, by American astronomer couple Carolyn and Eugene Shoemaker at the U.S Palomar Observatory in California.[3]

The dark C-type asteroid resides in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the gas giant's orbit (also see Trojans in astronomy). It orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 11 months (4,341 days). Its orbit has an eccentricity of 0.11 and an inclination of 34° with respect to the ecliptic.[1] The first used precovery was taken at the discovering observatory in 1989, extending the asteroid's observation arc by 2 years prior to its discovery.[3]

Photometric observations of this asteroid by astronomers Stefano Mottola and Anders Erikson with the Dutch 0.9-metre telescope at ESO's La Silla Observatory site in northern Chile during June 1994 were used to build a light curve. It showed a rotation period of 9.518±0.013 hours with a brightness variation of 0.34 ± 0.02 magnitude (U=3-).[9] In May 2015, another rotational light-curve was obtained by Robert Stephens at the Center for Solar System Studies, California, using the Víctor M. Blanco Telescope. The light-curve rendered a concurring period of 9.540±0.007 hours with an amplitude of 0.20 in magnitude (U=3-).[10]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures between 68.5 and 81.4 kilometers in diameter and its surface has an albedo between 0.04 and 0.07.[1][6][7][8] The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, and derives an albedo of 0.06 with a diameter of 73.4 kilometers, based on an absolute magnitude of 9.3.[4]

The minor planet was named after Telephus from Greek mythology. He is the grandson of Zeus and son of Heracles, after whom the Apollo near-Earth asteroids 5731 Zeus and 5143 Heracles are named, respectively. Telephus was the son-in-law of King Priam of Troy, but fought with the Greeks in the Trojan war.[2] Naming citation was published on 12 July 1995 (M.P.C. 25444).[11]


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 5264 Telephus (1991 KC)" (2016-08-15 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5264) Telephus. Springer Berlin Heidelberg. p. 452. ISBN 978-3-540-00238-3. Retrieved 1 July 2016. 
  3. ^ a b c "5264 Telephus (1991 KC)". Minor Planet Center. Retrieved 1 July 2016. 
  4. ^ a b c d e f "LCDB Data for (5264) Telephus". Asteroid Lightcurve Database (LCDB). Retrieved 1 July 2016. 
  5. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 1 June 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 1 July 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 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 1 July 2016. 
  9. ^ 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 1 July 2016. 
  10. ^ a b Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091. Retrieved 1 July 2016. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 July 2016. 

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