Altona measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0356 and a diameter of 80.85 kilometers based on an absolute magnitude of 9.7. Alternative mean-diameter measurements published by the WISE team include (), (), () and () with corresponding albedos of (), (), (), and (). An asteroid occultation observed on 3 April 2008, gave a best-fit ellipse dimension of (). These timed observations are taken when the asteroid passes in front of a distant star. Notes 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 000850 Discoveries by Sergei Belyavsky Named minor planets 19160327