1215 Boyer
Discovery[1]
Discovered byA. Schmitt
Discovery siteAlgiers Obs.
Discovery date19 January 1932
Designations
(1215) Boyer
Named after
Louis Boyer
(French astronomer)[2]
1932 BA
main-belt · (middle)
Eunomia[3] · Maria[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc85.46 yr (31,214 days)
Aphelion2.9213 AU
Perihelion2.2352 AU
2.5783 AU
Eccentricity0.1331
4.14 yr (1,512 days)
324.91°
0° 14m 17.16s / day
Inclination15.915°
123.74°
266.02°
Physical characteristics
Dimensions13.041±0.106 km[5]
14.705±0.091 km[6]
17.47 km (calculated)[3]
20.68±0.79 km[7]
23.06±4.95 km[8]
24.65±0.36 km[9]
10.36±0.05 h[4]
0.116±0.022[9]
0.147±0.013[7]
0.17±0.08[8]
0.21 (assumed)[3]
0.3012±0.1397[6]
Tholen = S[1] · S[3]
B–V = 0.900[1]
U–B = 0.459[1]
11.00[8][9]
11.1[1][3][6]
11.14[7]
11.53±0.15[10]

    1215 Boyer, provisional designation 1932 BA, is a stony Eunomian asteroid from the central region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered by astronomer Alfred Schmitt in 1932, who named it after French astronomer and college Louis Boyer.[11]

    Discovery

    Boyer was discovered on 19 January 1932, by French astronomer Alfred Schmitt at the Algiers Observatory in Algeria, North Africa.[1] Eight days later, it was independently discovered by Karl Reinmuth at Heidelberg Observatory in Germany.[2] The body's observation arc begins at Algiers with its official discovery observation.[11]

    Classification and orbit

    Boyer is a member of the Eunomia family (502), the most prominent family in the intermediate main-belt, which mostly consists of stony asteroids. Conversely, Boyer has also been grouped into the Maria family (506).[4]

    It orbits the Sun at a distance of 2.2–2.9 AU once every 4 years and 2 months (1,512 days). Its orbit has an eccentricity of 0.13 and an inclination of 16° with respect to the ecliptic.[1]

    Physical characteristics

    In the Tholen classification, Boyer is a common, stony S-type asteroid.[1]

    Lightcurves

    In August 2008 and May 2012, two rotational lightcurves of Boyer were obtained from photometric observations by an international collaboration of astronomers studying the rotational properties of Maria asteroids, using the ground-based Wise Observatory in Israel. Lightcurve analysis gave a rotation period of 10.36 hours with a brightness variation of 0.31 and 050 magnitude, respectively (U=2-/2).[4]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Boyer measures between 13.041 and 24.65 kilometers in diameter and its surface has an albedo between 0.116 and 0.3012.[5][6][7][8][9]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21, derived from the Eunomia family's largest member and namesake, 15 Eunomia, and calculates a diameter of 17.47 kilometers with an absolute magnitude of 11.1.[3]

    Naming

    This minor planet was named by the discoverer after his colleague at Algiers Observatory, Louis Boyer (1901–1999), who worked extensively on asteroids and comets. Boyer himself was a discoverer of minor planets at Algiers. He later worked on identifications at Nice observatory.[2] The official naming citation was published by the Minor Planet Center on 1 August 1978 (M.P.C. 4418).[12]

    References

    1. 1 2 3 4 5 6 7 8 9 "JPL Small-Body Database Browser: 1215 Boyer (1932 BA)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 17 August 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1215) Boyer". Dictionary of Minor Planet Names – (1215) Boyer. Springer Berlin Heidelberg. p. 101. doi:10.1007/978-3-540-29925-7_1216. ISBN 978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (1215) Boyer". Asteroid Lightcurve Database (LCDB). Retrieved 17 August 2017.
    4. 1 2 3 4 Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; Brosch, N.; Kaplan, M.; et al. (March 2014). "Rotational Properties of the Maria Asteroid Family". The Astronomical Journal. 147 (3): 15. arXiv:1311.5318. Bibcode:2014AJ....147...56K. doi:10.1088/0004-6256/147/3/56.
    5. 1 2 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 17 August 2017.
    6. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    7. 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. (online, AcuA catalog p. 153)
    8. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 17 August 2017.
    9. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 17 August 2017.
    10. ↑ 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. Retrieved 17 August 2017.
    11. 1 2 "1215 Boyer (1932 BA)". Minor Planet Center. Retrieved 17 August 2017.
    12. ↑ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
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