of them, 1001 Gaussia for Gauss and 1002 Olbersia for Olbers were named along with 1000 Piazzia. In the next few years only three more astronomical bodies were found between Mars and Jupiter, Pallas, Juno, and 4 Vesta, however it would be 37 years before another asteroid was found, 5 Astraea in 1845. By 1868, 100 asteroids had been discovered, however it would not be until 1921 that the 1000th was discovered. The rate accelerated in the 20th century and the ten thousandth would be discovered in 1989. Physical characteristics In the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Piazzia is a carbonaceous C-type and Cb-subtype, respectively, latter which transitions to the somewhat "brighter" B-type asteroids. Rotation period After Piazzia had been published by The Minor Planet Bulletin as an opportunity for photometry in 2001, a classically shaped bimodal lightcurve was obtained by Robert Stephens at the Santana Observatory in Rancho Cucamonga, California. The lightcurve gave a rotation period of hours with a brightness variation of 0.45 magnitude (). A second lightcurve was obtained by astronomer René Roy in March 2007, rendering a period of hours and an amplitude of 0.2 magnitude (). Diameter and albedo The Collaborative Asteroid Lightcurve Link derives a low albedo of 0.05 and a diameter of 47.19 kilometers based on an absolute magnitude of 10.5. According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Piazzia measures between 45.72 and 51.55 kilometers in diameter and its surface has an albedo between 0.041 and 0.1119. See also List of minor planets: 1–1000 List of minor planets: 1001–2000 100000 Astronautica (the 100,000th numbered minor planet) References External links Asteroid Lightcurve Database (LCDB), query form (info ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 001000 Discoveries by Karl Wilhelm Reinmuth Named minor planets 19230812