11552 Boucolion

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11552 Boucolion
Discovery[1]
Discovered byE. W. Elst
Discovery siteCERGA Obs.
Discovery date27 January 1993
Designations
(11552) Boucolion
Pronunciation/baʊˈkoʊliɒn/[5]
Named after
Boucolion[1]
(Greek mythology)
1993 BD4 · 1975 NP1
1994 CE20
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 arc25.31 yr (9,243 d)
Aphelion6.0675 AU
Perihelion4.4713 AU
5.2694 AU
Eccentricity0.1515
12.10 yr (4,418 d)
220.22°
0° 4m 53.4s / day
Inclination14.679°
138.36°
182.38°
Jupiter MOID0.5638 AU
TJupiter2.9120
Physical characteristics
Mean diameter
51.14±0.52 km[6]
53.91±4.32 km[7]
32.44±0.05 h[8][a]
0.035±0.006[7]
0.062±0.007[6]
D (Pan-STARRS)[9]
D (SDSS-MOC)[10]
Absolute magnitude (H)
10.1[1][2][6]
10.18±0.24[9]
10.60[7]

11552 Boucolion /baʊˈkoʊliɒn/ is a Jupiter trojan from the Trojan camp, approximately 53 kilometers (33 miles) in diameter. It was discovered on 27 January 1993, by Belgian astronomer Eric Elst at the CERGA Observatory in Caussols, France.[1] The dark D-type asteroid is one of the 90 largest Jupiter trojans and has a long rotation period of 32.4 hours.[11] It was named from Greek mythology after the Boucolion, who lost his sons in the Trojan War.[1]

Orbit and classification[]

Boucolion is a dark 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 is also a non-family asteroid of the Jovian background population.[4] It orbits the Sun at a distance of 4.5–6.1 AU once every 12 years and 1 month (4,418 days; semi-major axis of 5.27 AU). Its orbit has an eccentricity of 0.15 and an inclination of 15° with respect to the ecliptic.[2]

The asteroid was first observed as 1975 NP1 at Crimea–Nauchnij in July 1973. The body's observation arc begins with its official discovery observation at Caussols in January 1993.[1]

Physical characteristics[]

In the SDSS-based taxonomy, Boucolion is a D-type asteroid,[10][12] the most common type among the larger Jupiter trojans. It has also been characterized as a D-type by Pan-STARRS' survey, while the Collaborative Asteroid Lightcurve Link assumes it to be a carbonaceous C-type asteroid.[9][11]

Rotation period[]

In September 2012, a rotational lightcurve of Boucolion was first obtained from photometric observations by astronomers at the Palomar Transient Factory (PTF) in California. Lightcurve analysis gave a rotation period of 16.150 and 16.177 hours with a brightness amplitude of 0.23 and 0.25 magnitude in the R- and S-band, respectively (U=2/2).[11][13]

A more refined, alternative period solution of 32.44±0.05 hours with an amplitude of 0.21 magnitude was measured by Robert Stephens at the Center for Solar System Studies in January 2015 (U=2).[8][a] The result seems to be a 1:2 alias, i.e. twice the period, of the previously obtained lightcurve at the PTF. While not being a slow rotator, Boucolion has one of the longest periods among the larger Jupiter trojans (see table below).[11]

Diameter and albedo[]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Boucolion measures 51.136 and 53.91 kilometers in diameter and its surface has an albedo of 0.062 and 0.035, respectively.[6][7] CALL assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.[11]

100+ largest Jupiter trojans

Naming[]

This minor planet was named from Greek mythology after Boucolion, father of the two Trojan warriors Pedasos and , who both were slain near the River Scamander during the Trojan War. The official naming citation was published by the Minor Planet Center on 6 January 2003 (M.P.C. 47299).[14]

Notes[]

  1. ^ Jump up to: a b Lightcurve plot of (11552) Boucolion from Jan 2015 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3- (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References[]

  1. ^ Jump up to: a b c d e f g "11552 Boucolion (1993 BD4)". Minor Planet Center. Retrieved 20 June 2018.
  2. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 11552 Boucolion (1993 BD4)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2018.
  3. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 20 June 2018.
  4. ^ Jump up to: a b "Asteroid (11552) Boucolion – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 June 2018.
  5. ^ 'Bucolion' in Noah Webster (1884) A Practical Dictionary of the English Language
  6. ^ 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)
  7. ^ 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)
  8. ^ Jump up to: a b Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2015). "Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January". The Minor Planet Bulletin. 42 (3): 216–224. Bibcode:2015MPBu...42R.216S. ISSN 1052-8091.
  9. ^ Jump up to: a b c 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.
  10. ^ 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)
  11. ^ Jump up to: a b c d e "LCDB Data for (11552) Boucolion". Asteroid Lightcurve Database (LCDB). Retrieved 20 June 2018.
  12. ^ "Asteroid 11552 Boucolion". Small Bodies Data Ferret. Retrieved 20 June 2018.
  13. ^ 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.
  14. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 June 2018.

External links[]

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