1583 Antilochus

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1583 Antilochus
Discovery [1]
Discovered by S. Arend
Discovery site Uccle Obs.
Discovery date 19 September 1950
MPC designation (1583) Antilochus
Pronunciation /ænˈtɪləkəs/ an-TIL-ə-kəs
Named after
(Greek mythology)[2]
1950 SA · 1926 VF
1974 WH1
Jupiter trojan[1][3]
(Greek camp)[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 90.57 yr (33,080 days)
Aphelion 5.3947 AU
Perihelion 4.8642 AU
5.1294 AU
Eccentricity 0.0517
11.62 yr (4,243 days)
0° 5m 5.28s / day
Inclination 28.513°
Jupiter MOID 0.0279 AU
Jupiter Tisserand parameter 2.7570
Physical characteristics
Dimensions 101.62±3.2 km[5]
108.842±0.543 km[6][7]
111.69±3.86 km[8]
12 h[9][10]
22.5±0.5 h[10]
31.52±0.01 h[11]
31.54±0.02 h[12]
Tholen = D[1] · D[13]
B–V = 0.752[1]
U–B = 0.253[1]
8.58[5] · 8.59±0.06[13][14][15] · 8.6[1][6][8] · 8.65±0.39[16]

1583 Antilochus (/ænˈtɪləkəs/ an-TIL-ə-kəs), provisional designation 1950 SA, is a dark and reddish Jupiter trojan from the Greek camp, approximately 105 kilometers in diameter. It was discovered on 19 September 1950, by Belgian astronomer Sylvain Arend at Uccle Observatory in Belgium, and later named after the Greek hero Antilochus.[2][3]

Classification and orbit[edit]

Antilochus 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 (see Trojans in astronomy). It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,243 days). Its orbit has an eccentricity of 0.05 and an inclination of 29° with respect to the ecliptic.[1] It was first observed as 1926 VF Heidelberg Observatory in 1926. The body's observation arc begins with its official discovery observation at Uccle in 1950.[3]

Physical characteristics[edit]

In the Tholen classification, Antilochus is classified as a dark D-type asteroid. It is the 9th largest among a total of 46 known asteroids of this spectral type.[1][17]

Rotation period[edit]

In 2009 and 2016, the best rated rotational lightcurves of Antilochus were obtained from photometric observations by American astronomer Robert Stephens at the Santana Observatory (646) and at the Center for Solar System Studies (CS3) in California. Lightcurve analysis gave a rotation period of 31.52 and 31.54 hours with a brightness amplitude of 0.09 and 0.11 magnitude, respectively (U=3−/3).[11][12] While not being a slow rotator, Antilochus has a longer than average rotation period.

Diameter and albedo[edit]

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, Antilochus measures between 101.62 and 111.69 kilometers in diameter and its surface has an albedo between 0.053 and 0.063.[5][6][7][8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0633 and a diameter of 101.62 kilometers, with Pravec's revised absolute magnitude of 8.59.[13]


This minor planet was named after prince Antilochus from Greek mythology. He was the youngest son of king Nestor (659 Nestor), close friend of Greek hero Achilles (588 Achilles) and commander of the Greek contingent of the Pylians during the Trojan War.[2] The official naming citation was published before November 1977 (M.P.C. 770).[18]


  1. ^ a b c d e f g h i "JPL Small-Body Database Browser: 1583 Antilochus (1950 SA)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1583) Antilochus. Springer Berlin Heidelberg. p. 125. ISBN 978-3-540-00238-3. Retrieved 25 April 2017. 
  3. ^ a b c "1583 Antilochus (1950 SA)". Minor Planet Center. Retrieved 25 April 2017. 
  4. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 25 April 2017. 
  5. ^ 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. Bibcode:2004PDSS...12.....T. Retrieved 25 April 2017. 
  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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 25 April 2017. 
  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 25 April 2017. 
  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 25 April 2017. 
  9. ^ Zappala, V.; di Martino, M.; Cellino, A.; de Sanctis, G.; Farinella, P. (December 1989). "Rotational properties of outer belt asteroids". Icarus: 354–368.ResearchsupportedbyCNRandMPI. Bibcode:1989Icar...82..354Z. doi:10.1016/0019-1035(89)90043-2. ISSN 0019-1035. Retrieved 25 April 2017. 
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1583) Antilochus". Geneva Observatory. Retrieved 25 April 2017. 
  11. ^ a b Stephens, Robert D. (April 2010). "Trojan Asteroids Observed from GMARS and Santana Observatories: 2009 October – December". The Minor Planet Bulletin. 37 (2): 47–48. Bibcode:2010MPBu...37...47S. ISSN 1052-8091. Retrieved 25 April 2017. 
  12. ^ 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 25 April 2017. 
  13. ^ a b c "LCDB Data for (1583) Antilochus". Asteroid Lightcurve Database (LCDB). Retrieved 25 April 2017. 
  14. ^ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 25 April 2017. 
  15. ^ Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. Bibcode:1995LPI....26.1511W. Retrieved 25 April 2017. 
  16. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 April 2017. 
  17. ^ "JPL Small-Body Database Search list of D-type minor planets (Tholen and SMASSII)". JPL Solar System Dynamics. Retrieved 25 April 2017. 
  18. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 April 2017. 

External links[edit]