1749 Telamon

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1749 Telamon
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date23 September 1949
Designations
(1749) Telamon
Pronunciation/ˈtɛləmɒn/[7]
Named after
Telamon [2]
(Greek mythology)
1949 SB · 1941 BP
1966 CN
Minor planet category
Jupiter trojan [1][3][4]
Greek [5][6] · background [6]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc68.67 yr (25,081 d)
Aphelion5.7006 AU
Perihelion4.5987 AU
5.1497 AU
Eccentricity0.1070
11.69 yr (4,268 d)
189.63°
0° 5m 3.48s / day
Inclination6.0943°
340.87°
113.06°
Jupiter MOID0.3162 AU
TJupiter2.9770
Physical characteristics
Mean diameter
64.90±0.67 km[8]
69.14±4.57 km[9]
81.06±7.0 km[10]
16.975±0.001 h[11]
0.0562±0.011[10]
0.073±0.011[8]
0.078±0.011[9]
D (SMASS-I)[12]
D (SDSS-MOC)[13]
D Pan-STARRS[4][14]
Absolute magnitude (H)
9.20[9][10]
9.4[3][8]

1749 Telamon /ˈtɛləmɒn/ is a dark Jupiter Trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 23 September 1949,[1] and named after Telamon from Greek mythology.[2] The D-type asteroid is the principal body of the proposed Telamon family and belongs to the 60 largest Jupiter trojans. It has a rotation period of 17.0 hours and possibly a spherical shape.[4]

Classification and orbit[]

Telamon 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).[5] It orbits the Sun at a distance of 4.6–5.7 AU once every 11 years and 8 months (4,268 days; semi-major axis of 5.15 AU). Its orbit has an eccentricity of 0.11 and an inclination of 6° with respect to the ecliptic.[3] The body's observation arc begins at with its first observation as 1941 BP at Turku Observatory in January 1941, more than 8 years prior to its official discovery observation at Heidelberg.[1]

Telamon family[]

Fernando Roig and Ricardo Gil-Hutton identified Telamon as the principal body of a small Jovian asteroid family, using the hierarchical clustering method (HCM), which looks for groupings of neighboring asteroids based on the smallest distances between them in the proper orbital element space. According to the astronomers, the Telamon family belongs to the larger Menelaus clan, an aggregation of Jupiter trojans which is composed of several families, similar to the Flora family in the inner asteroid belt.[15]: 9, 10 

However this family is not included in David Nesvorný's HCM-analysis from 2014.[16][12] Instead, Telamon is listed as a non-family asteroid of the Jovian background population on the Asteroids Dynamic Site (AstDyS) which based on another analysis by Milani and Knežević.[6]

Physical characteristics[]

Telamon is a dark D-type asteroid according to the SDSS-based taxonomy and the surveys conducted by SMASS (Xu) and Pan-STARRS.[4][12][13][14]

Diameter and albedo[]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Telamon measures between 64.90 and 81.06 kilometers in diameter and its surface has an albedo between 0.046 and 0.078.[8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0469 and a diameter of 80.91 kilometers based on an absolute magnitude of 9.4.[4]

100+ largest Jupiter trojans

Lightcurves[]

Photometric observations of Telamon by Stefano Mottola from August 1995 were used to build a lightcurve rendering a rotation period of 11.2 hours with a brightness variation of 0.1±0.01 in magnitude (U=2).[17] In October 2010, another observation by Robert Stephens at the Goat Mountain Astronomical Research Station (G79) in California gave a period of 16.975 hours (U=3-).[11]

In August 2017, observations by the K2 mission of the Kepler spacecraft during Campaign 6 gave two periods of 11.331 and 22.613 hours with an amplitude of 0.06 and 0.07 magnitude, respectively (U=2/2-).[18][19] The body is possibly of spherical shape as all lightcurves measured a very small variation in brightness.[4]

Naming[]

This minor planet was named by the discoverer after Telamon, from Greek mythology, who was an argonaut searching for the Golden Fleece, and father of Ajax and Teucer, after whom the minor planets 1404 Ajax and 2797 Teucer are named.[2]

Telamon banished his son Teucer (as he had been banished by his own father) when he returned home from the Trojan war without the remains of his brother.[2] The official naming citation was published by the Minor Planet Center on 15 February 1970 (M.P.C. 3023).[20]

References[]

  1. ^ Jump up to: a b c d "1749 Telamon (1949 SB)". Minor Planet Center. Retrieved 8 June 2018.
  2. ^ Jump up to: a b c d Schmadel, Lutz D. (2007). "(1749) Telamon". Dictionary of Minor Planet Names – (1749) Telamon. Springer Berlin Heidelberg. p. 139. doi:10.1007/978-3-540-29925-7_1750. ISBN 978-3-540-00238-3.
  3. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 1749 Telamon (1949 SB)" (2016-08-03 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
  4. ^ Jump up to: a b c d e f "LCDB Data for (1749) Telamon". Asteroid Lightcurve Database (LCDB). Retrieved 8 June 2018.
  5. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 5 June 2018.
  6. ^ Jump up to: a b c "Asteroid (1749) Telamon – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 19 October 2019.
  7. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  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 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)
  10. ^ Jump up to: a b c d 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 17 October 2019.
  11. ^ Jump up to: a b French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). "Preliminary Results from a Study of Trojan Asteroids". The Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091. Retrieved 20 December 2016.
  12. ^ Jump up to: a b c "Asteroid 1749 Telamon". Small Bodies Data Ferret. Retrieved 8 June 2018.
  13. ^ 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)
  14. ^ Jump up to: a b 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339. Retrieved 20 December 2016.
  15. ^ Roig, F.; Ribeiro, A. O.; Gil-Hutton, R. (June 2008). "Taxonomy of asteroid families among the Jupiter Trojans: comparison between spectroscopic data and the Sloan Digital Sky Survey colors". Astronomy and Astrophysics. 483 (3): 911–931. arXiv:0712.0046. Bibcode:2008A&A...483..911R. doi:10.1051/0004-6361:20079177. S2CID 118361725.
  16. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
  17. ^ 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.
  18. ^ Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O.; et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids". Astronomy and Astrophysics. 599: 13. arXiv:1609.02760. Bibcode:2017A&A...599A..44S. doi:10.1051/0004-6361/201629401. S2CID 119275951.
  19. ^ Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal. 153 (3): 12. Bibcode:2017AJ....153..116R. doi:10.3847/1538-3881/153/3/116. Retrieved 8 June 2018.
  20. ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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