(7563) 1988 BC

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(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[1] · (middle)[2]
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 28.76 yr (10,505 days)
Aphelion 3.2897 AU
Perihelion 2.0687 AU
2.6792 AU
Eccentricity 0.2279
4.39 yr (1,602 days)
255.04°
Inclination 12.678°
83.538°
52.918°
Physical characteristics
Dimensions 12.12 km (calculated)[2]
15.857±0.103[3]
16.134±0.099 km[4]
17.27±0.64 km[5]
6.510±0.006 h[6]
6.539±0.005 h[7]
0.0483±0.0030[4]
0.073±0.006[5]
0.078±0.015[3]
0.10 (assumed)[2]
S[2]
12.3[4][5] · 12.59±0.27[8] · 12.7[1][2]

(7563) 1988 BC is a stony asteroid from the central region of the asteroid belt, approximately 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.[9]

Classification and orbit[edit]

The asteroid orbits the Sun in the central main-belt at a distance of 2.1–3.3 AU once every 4 years and 5 months (1,602 days). Its orbit has an eccentricity of 0.23 and an inclination of 13° with respect to the ecliptic.[1]

Physical characteristics[edit]

Lightcurves[edit]

In 2010, a photometric lightcurve 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 magnitude (U=3).[7] A previous 2006-observation by American astronomer Brian Warner at his Palmer Divide Observatory (716), Colorado, gave a period of 6.510 hours and an amplitude of 0.24 magnitude (U=3-).[6]

Diameter and albedo[edit]

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 between 0.048 and 0.078, with a diameter between 15.857 and 17.27 kilometers.[3][4][5]

Despite the results from the space-based observations, the Collaborative Asteroid Lightcurve Link assumes a higher albedo of 0.10 – a compromise between the stony and carbonaceous asteroid populations from the inner and outer main-belt, respectively – and hence calculates a smaller diameter of 12.1 kilometers with an absolute magnitude of 12.7.[2]

Naming[edit]

As of 2017, 1988 BC remains unnamed.[9]

References[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 7563 (1988 BC)" (2016-10-20 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017. 
  2. ^ a b c d e f "LCDB Data for (7563)". Asteroid Lightcurve Database (LCDB). Retrieved 22 August 2016. 
  3. ^ a b c 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 11 March 2017. 
  4. ^ a b c d 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. ^ 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. Retrieved 22 August 2016. 
  6. ^ a b 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. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (7563)". Geneva Observatory. Retrieved 22 August 2016. 
  8. ^ 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. 
  9. ^ a b "7563 (1988 BC)". Minor Planet Center. Retrieved 22 August 2016. 

External links[edit]