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 /ˈtɛləfəs/ TEL-ə-fəs
Named after
Telephus (Greek mythology)[2]
1991 KC · 1965 AO
Jupiter trojan[3][4]
(Greek camp)[5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 52.34 yr (19,116 days)
Aphelion 5.7854 AU
Perihelion 4.6318 AU
5.2086 AU
Eccentricity 0.1107
11.89 yr (4,342 days)
0° 4m 58.44s / day
Inclination 33.576°
Jupiter MOID 0.6413 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 (/ˈtɛləfəs/ 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 Palomar Observatory in California, United States.[3] It was named after Telephus from Greek mythology.[2]

Classification and orbit[edit]

The dark 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 (4,342 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 official discovery observation.[3]

Physical characteristics[edit]

Telephus is a common carbonaceous C-type asteroid.[4]

Rotation period[edit]

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 lightcurve. It showed a rotation period of 9.518 hours with a brightness variation of 0.34 ± 0.02 magnitude (U=3-).[9]

In May 2015, another rotational lightcurve was obtained by Robert Stephens and Daniel Coley at the Center for Solar System Studies (U81), California, and Linda French at Wesleyan University, using the 4-meter Víctor M. Blanco Telescope in Chile. The lightcurve rendered a concurring period of 9.540 hours with an amplitude of 0.20 in magnitude (U=3-).[10]

Diameter and albedo[edit]

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]


This 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] The official naming citation was published by the Minor Planet Center 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)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 3 June 2017. 
  2. ^ a b c 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 g "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. 

External links[edit]