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5264 Telephus

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5264 Telephus
Discovery [1]
Discovered byC. Shoemaker
E. Shoemaker
Discovery sitePalomar Obs.
Discovery date17 May 1991
Designations
(5264) Telephus
Pronunciation/ˈtɛləfəs/[2]
Named after
Telephus (Greek mythology)[3]
1991 KC · 1965 AO
Jupiter trojan [1][4][5]
Greek [6][7] · background [7]
AdjectivesTelephian
Orbital characteristics [4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc52.82 yr (19,294 d)
Aphelion5.7852 AU
Perihelion4.6329 AU
5.2090 AU
Eccentricity0.1106
11.89 yr (4,342 d)
167.15°
0° 4m 58.44s / day
Inclination33.575°
121.90°
359.69°
Jupiter MOID0.6419 AU
TJupiter2.6560
Physical characteristics
68.47±1.19 km[8]
73.26±5.0 km[9]
73.33 km (derived)[5]
81.38±4.78 km[10]
9.518±0.013 h[11]
9.525±0.002 h[12][a]
9.540±0.007 h[13][a]
0.043±0.005[10]
0.0522±0.008[9]
0.0571 (derived)[5]
0.072±0.024[8]
D (SDSS-MOC)[14]
D (S3OS2)[15]
C (assumed)[5]
V–I = 0.970±0.034[5]
9.3[8]
9.4[1][4][5]
9.50[10]

5264 Telephus /ˈtɛləfəs/ is a large Jupiter trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. It was discovered on 17 May 1991, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California,[1] and later named after King Telephus from Greek mythology.[3] The dark and possibly elongated D-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 9.5 hours.[5]

Classification and orbit[edit]

Telephus is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[7][16]

It orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 11 months (4,342 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.11 and an inclination of 34° with respect to the ecliptic.[4] The asteroid was first observed as 1965 AO at the Purple Mountain Observatory in January 1965. The body's observation arc begins with a precovery taken at Palomar in January 1989, more than 2 years prior to its official discovery observation.[1]

Physical characteristics[edit]

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Telephus is a D-type asteroid.[16][15] In the SDSS-based taxonomy, it is also a D-type,[14] while the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a C-type.[5]

Rotation period[edit]

In June 1994, 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, Chile, were used to build a lightcurve. It showed a rotation period of 9.518 hours with a brightness amplitude of 0.34±0.02 magnitude (U=3-).[11]

In May 2015, Telephus was observed in Chile, using the 4-meter Víctor M. Blanco Telescope and its DECam with a red filter in Chile. The lightcurve gave a concurring period of 9.540 hours and an brightness variation of 0.20 in magnitude (U=3-).[13] In May 2016, follow-up observation by Robert Stephens and Daniel Coley at the Center for Solar System Studies, California, and Linda French at Wesleyan University gave the so-far best rated period of 9.525±0.002 hours with an amplitude of 0.47 (U=3).[5][12][a] Due to its higher than usual brightness variation, this Jovian asteroid is likely to have a non-spherical shape.

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 68.47 and 81.38 kilometers in diameter and its surface has an albedo between 0.043 and 0.072.[8][9][10] CALL agrees with the results obtained by IRAS, and derives an albedo of 0.0571 with a diameter of 73.33 kilometers, based on an absolute magnitude of 9.4.[5]

100+ largest Jupiter trojans

Naming[edit]

This minor planet was named from Greek mythology after King Telephus. He is the grandson of Zeus and son of Heracles, after whom the Apollo near-Earth asteroids 5731 Zeus and 5143 Heracles were named, respectively. Telephus was the son-in-law of King Priam of Troy, but fought with the Greeks in the Trojan War.[3] The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25444).[17]

Notes[edit]

  1. ^ Jump up to: a b c Lightcurve plots of (5264) Telephus from May 2015, May 2016 and July 2017 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3/3/3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References[edit]

  1. ^ Jump up to: a b c d e "5264 Telephus (1991 KC)". Minor Planet Center. Retrieved 9 June 2018.
  2. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  3. ^ Jump up to: a b c Schmadel, Lutz D. (2007). "(5264) Telephus". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 452. doi:10.1007/978-3-540-29925-7_5090. ISBN 978-3-540-00238-3.
  4. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 5264 Telephus (1991 KC)" (2017-10-29 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2018.
  5. ^ Jump up to: a b c d e f g h i j "LCDB Data for (5264) Telephus". Asteroid Lightcurve Database (LCDB). Retrieved 9 June 2018.
  6. ^ "List of Jupiter Trojans". Minor Planet Center. 31 May 2018. Retrieved 9 June 2018.
  7. ^ Jump up to: a b c "Asteroid (5264) Telephus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 9 June 2018.
  8. ^ Jump up to: a b c d 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:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  9. ^ Jump up to: a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
  10. ^ Jump up to: 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. (online, AcuA catalog p. 153)
  11. ^ Jump up to: 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.
  12. ^ Jump up to: a b Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091. Retrieved 9 June 2018.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  13. ^ Jump up to: 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  14. ^ Jump up to: a b Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
  15. ^ Jump up to: a b Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 9 June 2018.
  16. ^ Jump up to: a b "Asteroid 5264 Telephus". Small Bodies Data Ferret. Retrieved 9 June 2018.
  17. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 June 2018.

External links[edit]

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