| Discovery[1] | |
|---|---|
| Discovered by | T. Kojima |
| Discovery site | YGCO Chiyoda Stn. |
| Discovery date | 16 January 1988 |
| Designations | |
| (7563) 1988 BC | |
| 1988 BC · 1991 VJ5 | |
| main-belt[1][2] · (middle) background | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 30.03yr (10,969 d) |
| Aphelion | 3.2894AU |
| Perihelion | 2.0689 AU |
| 2.6792 AU | |
| Eccentricity | 0.2278 |
| 4.39 yr (1,602 d) | |
| 299.98° | |
| 0° 13m 29.28s / day | |
| Inclination | 12.678° |
| 83.534° | |
| 52.920° | |
| Physical characteristics | |
| 12.04±3.52 km[3] 13.93±0.10 km[4] 15.857±0.103 km[5][6] 16.134±0.099 km[7] 17.27±0.64 km[8] | |
| 6.539±0.005 h[9][10] | |
| 0.0483[7] 0.06[4] 0.073[8] 0.078[5] 0.078±0.015[6] 0.08[3] | |
| S(assumed)[9] | |
| 12.30[5][7][8] 12.70[3] 12.8[1][2][9] 12.90[4] | |
(7563) 1988 BC (provisional designation1988 BC) is a backgroundasteroid from the central region of theasteroid belt, approximately 16 kilometers (10 miles) in diameter. It was discovered on 16 January 1988, by Japanese amateur astronomerTakuo Kojima at theYGCO Chiyoda Station in the Kantō region of Japan.[1] The asteroid has arotation period of 6.5 hours.[9]
1988 BC is non-family asteroid of the main belt'sbackground population. It orbits the Sun in thecentral asteroid belt at a distance of 2.1–3.3 AU once every 4 years and 5 months (1,602 days;semi-major axis of 2.68 AU). Its orbit has aneccentricity of 0.23 and aninclination of 13° with respect to theecliptic.[2]
As of 2018,1988 BC remains unnamed.[1]
In January 2010, a rotationallightcurve of1988 BC was obtained fromphotometric observations byPierre Antonini at the Bédoin Observatory (132) in southeastern France. Lightcurve analysis gave arotation period of6.539±0.005 hours with a brightness variation of 0.30 inmagnitude (U=3).[10] A previous 2006-observation by American astronomerBrian Warner at hisPalmer Divide Observatory in Colorado gave a period of6.510 hours and an amplitude of 0.24 magnitude (U=3-).[11]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, the asteroid has a lowalbedo of between 0.048 and 0.08, with a diameter between 12.04 and 17.27 kilometers.[6][7][8]
Despite the results from the space-based observations, theCollaborative Asteroid Lightcurve Link assumes a higher albedo of 0.10 – a compromise between thestony andcarbonaceous asteroid populations from the inner and outer main-belt, respectively – and hence calculates a smaller diameter of 12.1 kilometers with anabsolute magnitude of 12.7.[9]
