(7563) 1988 BC

Asteroid September 2018 yes (7563) 1988 BC #D6D6D6 T. Kojima YGCO Chiyoda Stn. 16 January 1988 (7563) 1988 BC 1991 VJ 5 main-belt(middle)background 23 March 2018 (JD 2458200.5) 0 30.03 yr (10,969 d) 3.2894 AU 2.0689 AU 2.6792 AU 0.2278 4.39 yr (1,602 d) 299.98° 0.2248 ms / day 12.678° 83.534° 52.920° 12.04 3.52 km13.93 0.10 km15.857 0.103 km16.134 0.099 km17.27 0.64 km 6.539 0.005 h 0.04830.060.0730.0780.078 0.0150.08 S (assumed) 12.3012.7012.812.90 (7563) 1988 BC is a background asteroid from the central region of the asteroid belt, approximately 16 km mi off us 1 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 asteroid has a rotation period of 6.5 hours. Classification and orbit 1988 BC is a non-family asteroid of the main belt's background population. It orbits the Sun in the central 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 an eccentricity of 0.23 and an inclination of 13° with respect to the ecliptic. Naming As of 2018, 1988 BC remains unnamed. Physical characteristics Lightcurves In January 2010, a rotational lightcurve of 1988 BC was obtained from photometric observations by Pierre Antonini at the Bédoin Observatory 132 in southeastern France. Lightcurve analysis gave a rotation period of 6.539 0.005 hours with a brightness variation of 0.30 in magnitude (U=3). A previous 2006-observation by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado gave a period of 6.510 hours and an amplitude of 0.24 magnitude (U=3-). Diameter and albedo 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 0.08, with a diameter between 12.04 and 17.27 kilometers. 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. References 30em 2018-01-27 last obs. JPL Small-Body Database Browser: 7563 (1988 BC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007563 https://web.archive.org/web/20191215083932/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007563 dead 15 December 2019 Jet Propulsion Laboratory 13 September 2018 7563 (1988 BC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=7563 13 September 2018 Asteroids and comets rotation curves – (7563) Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page5cou.html#007563 13 September 2018 https://web.archive.org/web/20181111134209/http://obswww.unige.ch/~behrend/page5cou.html#007563 11 November 2018 dead 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 119293330 7563 13 September 2018 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 free (online, AcuA catalog p. 153) 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 118700974 (catalog) 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 2016PDSS..247.....M 13 September 2018 6 C. R. Nugent A. Mainzer J. Masiero J. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett R. Stevenson E. L. Wright December 2015 NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 119289027 free Warner, Brian D. December 2006 Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006 The Minor Planet Bulletin 33 4 85–88 1052-8091 2006MPBu...33...85W External links Lightcurve plot of (7563) 1988 BC, Palmer Divide Observatory, B. D. Warner (2006) Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center 7563 7562 Kagiroino-Oka 7563 7564 Gokumenon 007563 Category:Discoveries by Takuo Kojima 19880116