The Collaborative Asteroid Lightcurve Link adopts the results from IRAS, that is, an albedo of 0.1704 and a diameter of 45.27 km based on an absolute magnitude of 9.26. Further published mean-diameters and albedos by the WISE team include () and () with corresponding albedos of (), and (). Two asteroid occultations on 1 January 2004 and 12 February 2015, gave a best-fit ellipse dimension of 45.0 × 45.0 and 49.0 × 49.0 kilometers, respectively. These timed observations are taken when the asteroid passes in front of a distant star. However the quality of the measurements are poorly rated. References External links Lightcurve Database Query (LCDB), at www.minorplanet.info Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 000931 Discoveries by François Gonnessiat Named minor planets 000931 19200319