(7563) 1988 BC

(7563) 1988 BC
Discovery [1]
Discovered by T. Kojima
Discovery site YGCO Chiyoda Station
Discovery date 16 January 1988
Designations
MPC designation (7563) 1988 BC
1988 BC · 1991 VJ5
main-belt · (middle) [2]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 27.58 yr (10,072 days)
Aphelion 3.2896 AU
Perihelion 2.0666 AU
2.6781 AU
Eccentricity 0.2283
4.38 yr (1,601 days)
120.18°
Inclination 12.680°
83.554°
52.880°
Physical characteristics
Dimensions 17.27±0.64 km[3]
16.134±0.099 km[4]
12.12 km (calculated)[2]
6.539±0.005 h[5]
6.510±0.006 h[6]
0.073±0.006[3]
0.0483±0.0030[4]
0.10 (assumed)[2]
S [2]
12.7[1][2]
12.3[3][4]
12.59±0.27[7]

    (7563) 1988 BC is an unnamed, stony asteroid from the middle region of the asteroid belt, about 16 kilometers in diameter. It was discovered on 16 January 1988, by Japanese amateur astronomer Takuo Kojima at the YGCO Chiyoda Station in the Kantō region of Japan.[8]

    The S-type asteroid orbits the Sun at a distance of 2.1–3.3 AU once every 4 years and 5 months (1,601 days). Its orbit shows an eccentricity of 0.23 and an inclination of 13 degrees from the plane of the ecliptic.[1]

    In 2010, a photometric light-curve analysis by astronomer Pierre Antonini at the Bédoin Observatory (132) in southeastern France, gave it a rotation period of 6.539±0.005 hours with a brightness amplitude of 0.30 in magnitude (U=3).[5] A previous 2006-observation by Brian Warner at the U.S. Palmer Divide Observatory, Colorado, rendered a period of 6.510±0.006 hours and an amplitude of 0.24 in magnitude (U=3-).[6]

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid has a low albedo of 0.073 and 0.048, with a corresponding diameter of 17.3 and 16.1 kilometers, respectively.[3][4] The Collaborative Asteroid Lightcurve Link (CALL) disagrees with the space-based observations and assumes a higher albedo of 0.10, which is still a low value for stony asteroids, and hence calculates a smaller diameter of 12.1 kilometers.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 7563 (1988 BC)" (2015-08-14 last obs.). Jet Propulsion Laboratory. Retrieved 22 August 2016.
    2. 1 2 3 4 5 6 "LCDB Data for (7563)". Asteroid Lightcurve Database (LCDB). Retrieved 22 August 2016.
    3. 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 22 August 2016.
    4. 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 22 August 2016.
    5. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (7563)". Geneva Observatory. Retrieved 22 August 2016.
    6. 1 2 Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006". The Minor Planet Bulletin. 33 (4): 85–88. Bibcode:2006MPBu...33...85W. ISSN 1052-8091. Retrieved 22 August 2016.
    7. ↑ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 22 August 2016.
    8. ↑ "7563 (1988 BC)". Minor Planet Center. Retrieved 22 August 2016.

    External links


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