1583 Antilochus

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1583 Antilochus
Discovery [1]
Discovered byS. Arend
Discovery siteUccle Obs.
Discovery date19 September 1950
Designations
(1583) Antilochus
Pronunciation/ænˈtɪləkəs/[7]
Named after
Antilochus
(Greek mythology)[2]
1950 SA · 1926 VF
1974 WH1
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 arc91.53 yr (33,430 d)
Aphelion5.3959 AU
Perihelion4.8644 AU
5.1301 AU
Eccentricity0.0518
11.62 yr (4,244 d)
256.95°
0° 5m 5.28s / day
Inclination28.512°
221.38°
187.27°
Jupiter MOID0.0264 AU
TJupiter2.7570
Physical characteristics
Mean diameter
101.62±3.2 km[8]
108.84±0.54 km[9]
111.69±3.86 km[10]
15.889±0.005 h[11][a]
0.053±0.004[10]
0.054±0.004[9]
0.0633±0.004[8]
D (Tholen)[4][12]
D0 (Barucci)[12]
D (Tedesco)[12]
U–B = 0.253±038[12]
B–V = 0.752±020[12]
V–I = 0.950±0.043[4]
BR = 1.220±0.109[4]
Absolute magnitude (H)
8.58[8]
8.59±0.06[4][13][14]
8.60[1][3][9][10]

1583 Antilochus /ænˈtɪləkəs/ is a large Jupiter trojan from the Greek camp, approximately 108 kilometers (67 miles) in diameter. It was discovered on 19 September 1950, by Belgian astronomer Sylvain Arend at Uccle Observatory in Belgium, and later named after the hero Antilochus from Greek mythology.[1] The dark D-type asteroid belongs to the 20 largest Jupiter trojans and has a rotation period of 15.9 hours.[4] It forms an asteroid pair with 3801 Thrasymedes.

Classification and orbit[]

Antilochus is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance (see Trojans in astronomy).[5] It is also a non-family asteroid in the Jovian background population.[6]

It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,244 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.05 and an inclination of 29° with respect to the ecliptic.[3] The asteroid was first observed as 1926 VF at Heidelberg Observatory in November 1926. The body's observation arc begins with its official discovery observation at Uccle in September 1950.[1]

Asteroid pair[]

In 1993, Andrea Milani suggested that Antilochus forms an with 3801 Thrasymedes, 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.[15] Asteroid pairs, which at some point in the past had very small relative velocities, are typically formed by a collisional break-up of a parent body. Alternatively, they may have been former binary asteroids which became gravitationally unbound and are now following similar but different orbits around the Sun.[16]

The astronomer describes the finding as statistically significant though difficult to account for by a regular collisional event.[15][b] The Antilochus–Thrasymedes pair is not listed at the Johnston's archive.[16]

Naming[]

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 by the Minor Planet Center in May 1952 (M.P.C. 770).[17]

Physical characteristics[]

In the Tholen, Barucci and Tesco classification, Antilochus is a dark D-type asteroid,[12] with a V–I color index of 0.95.[4] The D-type is the most common spectral type among the Jupiter trojans.

Rotation period[]

In December 2009 and June 2016, 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 an amplitude of 0.09 and 0.11 magnitude, respectively (U=2/2).[18][19] Follow-up observations over a total of 11 nights by Stephens in August 2017 gave the so-far best-rated lightcurve with a period of 15.889±0.005 hours – which corresponds to half the period solution of the former results – and a slightly higher brightness variation of 0.12 magnitude (U=2+).[11][a]

Stephen's period determination supersedes previously reported results by Vincenzo Zappalà (1985; 12 h), Federico Manzini (2007; 12 h) and René Roy (2009; 22.5 h) (U=3−/3).[4][20][21]

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, Antilochus measures between 101.62 and 111.69 kilometers in diameter and its surface has an albedo between 0.053 and 0.063.[8][9][10] 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.[4]

100+ largest Jupiter trojans

Notes[]

  1. ^ Jump up to: a b Lightcurve plots of (1583) Antilochus from Jun 2016 and Aug 2017 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3/2+ (lightcurve rating at CS3). Summary figures at the LCDB and CS3.
  2. ^ Besides the asteroid pair Antilochus—Thrasymedes, Milani found five potential asteroid families in the Greek camp, clustered around the Jovian asteroids 1437 Diomedes, 1647 Menelaus, 2456 Palamedes, 2797 Teucer and (4035) 1986 WD, respectively (Milani 1993, p. 94).

References[]

  1. ^ Jump up to: a b c d e "1583 Antilochus (1950 SA)". Minor Planet Center. Retrieved 13 June 2018.
  2. ^ Jump up to: a b Schmadel, Lutz D. (2007). "(1583) Antilochus". Dictionary of Minor Planet Names – (1583) Antilochus. Springer Berlin Heidelberg. p. 125. doi:10.1007/978-3-540-29925-7_1584. ISBN 978-3-540-00238-3.
  3. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 1583 Antilochus (1950 SA)" (2018-05-21 last obs.). Jet Propulsion Laboratory. Retrieved 13 June 2018.
  4. ^ Jump up to: a b c d e f g h i "LCDB Data for (1583) Antilochus". Asteroid Lightcurve Database (LCDB). Retrieved 13 June 2018.
  5. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 13 June 2018.
  6. ^ Jump up to: a b c "Asteroid (1583) Antilochus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 13 June 2018.
  7. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  8. ^ 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 15 June 2018.
  9. ^ 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)
  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 Stephens, Robert D.; Warner, Brian D. (January 2018). "Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies 2017 July - September". The Minor Planet Bulletin. 45 (1): 48–50. Bibcode:2018MPBu...45...48S. ISSN 1052-8091. Retrieved 30 June 2018.
  12. ^ Jump up to: a b c d e f "Asteroid 1583 Antilochus". Small Bodies Data Ferret. Retrieved 13 June 2018.
  13. ^ 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.
  14. ^ 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. 26: 1511. Bibcode:1995LPI....26.1511W. Retrieved 25 April 2017.
  15. ^ Jump up to: a b Milani, Andrea (October 1993). "The Trojan asteroid belt: Proper elements, stability, chaos and families". Celestial Mechanics and Dynamical Astronomy. 57 (1–2): 59–94. Bibcode:1993CeMDA..57...59M. doi:10.1007/BF00692462. ISSN 0923-2958. S2CID 189850747. Retrieved 30 June 2018.
  16. ^ Jump up to: a b Johnston, Wm. Robert (29 April 2018). "Asteroid pairs and clusters". Johnston's Archive. Retrieved 30 June 2018.
  17. ^ 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.
  18. ^ 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.
  19. ^ 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.
  20. ^ Zappala, V.; di Martino, M.; Cellino, A.; de Sanctis, G.; Farinella, P. (December 1989). "Rotational properties of outer belt asteroids". Icarus. 82 (2): 354–368.ResearchsupportedbyCNRandMPI. Bibcode:1989Icar...82..354Z. doi:10.1016/0019-1035(89)90043-2. ISSN 0019-1035. Retrieved 25 April 2017.
  21. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1583) Antilochus". Geneva Observatory. Retrieved 13 June 2018.

External links[]

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