11552 Boucolion
Discovery [1] | |
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Discovered by | E. W. Elst |
Discovery site | CERGA Obs. |
Discovery date | 27 January 1993 |
Designations | |
MPC designation | (11552) Boucolion |
Pronunciation |
/bjuːˈkɒliən/ bew-KOL-ee-ən |
Named after |
Boucolion [1] (Greek mytholgoy) |
1993 BD4 · 1975 NP1 1994 CE20 | |
Jupiter trojan [1][2] Trojan [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 25.31 yr (9,243 d) |
Aphelion | 6.0675 AU |
Perihelion | 4.4713 AU |
5.2694 AU | |
Eccentricity | 0.1515 |
12.10 yr (4,418 d) | |
220.22° | |
0° 4m 53.4s / day | |
Inclination | 14.679° |
138.36° | |
182.38° | |
Jupiter MOID | 0.5638 AU |
TJupiter | 2.9120 |
Physical characteristics | |
Mean diameter |
±0.52 km 51.14[5] ±4.32 km 53.91[6] |
±0.05 h 32.44[7][lower-alpha 1] | |
±0.006 0.035[6] ±0.007 0.062[5] | |
D (Pan-STARRS)[8] D (SDSS-MOC)[9] | |
10.1[1][2][5] ±0.24 10.18[8] 10.60[6] | |
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11552 Boucolion (/bjuːˈkɒliən/ bew-KOL-ee-ən), provisional designation 1993 BD4, 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.[10] 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 .[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,[9][11] 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.[8][10]
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).[10][12]
An more refined, alternative period solution of ±0.05 hours with an amplitude of 0.21 magnitude was measured by 32.44Robert Stephens at the Center for Solar System Studies in January 2015 (U=2).[7][lower-alpha 1] 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).[10]
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.[5][6] 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.[10]
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Naming
This minor planet was named from Greek mythology after Boucolion, father of the two Trojan warriors Pedasos and Aesopos, 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).[13]
Notes
References
- 1 2 3 4 5 6 7 "11552 Boucolion (1993 BD4)". Minor Planet Center. Retrieved 20 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 11552 Boucolion (1993 BD4)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 20 June 2018.
- 1 2 "Asteroid (11552) Boucolion – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 June 2018.
- 1 2 3 4 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. Retrieved 20 June 2018. (online catalog)
- 1 2 3 4 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 20 June 2018. (online, AcuA catalog p. 153)
- 1 2 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. Retrieved 20 June 2018.
- 1 2 3 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 20 June 2018.
- 1 2 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 12 June 2018.
- 1 2 3 4 5 "LCDB Data for (11552) Boucolion". Asteroid Lightcurve Database (LCDB). Retrieved 20 June 2018.
- ↑ "Asteroid 11552 Boucolion". Small Bodies Data Ferret. Retrieved 20 June 2018.
- ↑ 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" (PDF). The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 20 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
- 11552 Boucolion at AstDyS-2, Asteroids—Dynamic Site
- 11552 Boucolion at the JPL Small-Body Database