|Discovered by T. Kojima|
MPC designation (7563) 1988 BC
Minor planet category main-belt · (middle)
Discovered 16 January 1988
Discovery site YGCO Chiyoda Station
|Discovery date 16 January 1988|
Alternative names 1988 BC · 1991 VJ5
Observation arc 27.58 yr (10,072 days)
Absolute magnitude 12.3
Discoverer Takuo Kojima
Asteroid group Asteroid belt
|People also search for Sun, 4576 Yanotoyohiko|
(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.
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.
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 7000653900000000000♠6.539±0.005 hours with a brightness amplitude of 0.30 in magnitude (U=3). A previous 2006-observation by Brian Warner at the U.S. Palmer Divide Observatory, Colorado, rendered a period of 7000651000000000000♠6.510±0.006 hours and an amplitude of 0.24 in magnitude (U=3-).
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. 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.