12052 Aretaon

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12052 Aretaon
Discovery [1]
Discovered byE. W. Elst
Discovery siteLa Silla Obs.
Discovery date3 May 1997
Designations
(12052) Aretaon
Pronunciation/ærɪˈteɪɒn/
Named after
Ἀρετάων Aretāōn[1]
(Greek mythology)
1997 JB16 · 1977 UG5
1999 NE62
Minor planet category
Jupiter trojan [1][2]
Trojan [3] · background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc40.60 yr (14,828 d)
Aphelion5.5958 AU
Perihelion4.8837 AU
5.2397 AU
Eccentricity0.0680
11.99 yr (4,381 d)
197.23°
0° 4m 55.92s / day
Inclination11.463°
219.79°
85.727°
Jupiter MOID0.256 AU
TJupiter2.9550
Physical characteristics
Mean diameter
39.151±0.809 km[5]
42.23 km (calculated)[6]
8.05 h[7]
0.057 (assumed)[6]
0.073±0.013[5]
C (assumed)[6]
Absolute magnitude (H)
10.425±0.002 (R)[8]
10.50[5]
10.6[1][2][6]

12052 Aretaon /ærɪˈteɪɒn/ is a mid-sized Jupiter trojan from the Trojan camp, approximately 40 kilometers (25 miles) in diameter. It was discovered on 3 May 1997, by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile.[1] The dark Jovian asteroid has a rotation period of 8.05 hours.[6] It was named after Aretaon from Greek mythology.[1]

Orbit and classification[]

Aretaon is a Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L5 Lagrangian point, 60° behind its orbit (see Trojans in astronomy).[3] It orbits the Sun at a distance of 4.9–5.6 AU once every 11 years and 12 months (4,381 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.07 and an inclination of 11° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1977 UG5 at the Palomar Observatory in October 1977, almost 20 years prior to its official discovery observation at La Silla.[1]

Naming[]

This minor planet was named from Greek mythology after the Trojan warrior Aretaon. He was killed by Teucer during the Trojan War.[1] The official naming citation was published by the Minor Planet Center on 6 January 2003 (M.P.C. 47300).[9]

Physical characteristics[]

Aretaon is an assumed, carbonaceous C-type asteroid.[6] The majority of Jupiter trojans are D-types, with the reminder being mostly C- and P-type asteroids.[6]

Rotation period[]

In September 2012, a rotational lightcurve of Aretaon was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in Landers, California. Lightcurve analysis gave a rotation period of 8.05 hours with a brightness amplitude of 0.17 magnitude (U=2).[7] This period determination was confirmed by astronomers at the Palomar Transient Factory in September 2013, measuring a period of 8.048 hours and an amplitude of 0.19 magnitude in the R-band (U=2).[8]

Diameter and albedo[]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Aretaon measures 39.151 kilometers in diameter and its surface has an albedo of 0.073,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 42.23 kilometers based on an absolute magnitude of 10.6.[6]

100+ largest Jupiter trojans

References[]

  1. ^ Jump up to: a b c d e f g h "12052 Aretaon (1997 JB16)". Minor Planet Center. Retrieved 30 June 2018.
  2. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 12052 Aretaon (1997 JB16)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2018.
  3. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 30 June 2018.
  4. ^ "Asteroid (12052) Aretaon – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 30 June 2018.
  5. ^ 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)
  6. ^ Jump up to: a b c d e f g h "LCDB Data for (12052) Aretaon". Asteroid Lightcurve Database (LCDB). Retrieved 30 June 2018.
  7. ^ Jump up to: a b French, Linda M.; Stephens, Robert, D.; Coley, Daniel R.; Wasserman, Lawrence H.; Vilas, Faith; La Rocca, Daniel (October 2013). "A Troop of Trojans: Photometry of 24 Jovian Trojan Asteroids". The Minor Planet Bulletin. 40 (4): 198–203. Bibcode:2013MPBu...40..198F. ISSN 1052-8091.
  8. ^ Jump up to: a b Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. S2CID 8342929.
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 30 June 2018.

External links[]

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