Tanina was obtained from photometric observations by Italian astronomer Andrea Ferrero at the Bigmuskie Observatory . Lightcurve analysis gave a well-defined rotation period of hours with a high brightness variation of magnitude, indicative of an elongated, non-spherical shape (). The result supersedes previous period determinations of hours with an amplitude of magnitude () by Wiesław Z. Wiśniewski from February 1992, and hours with an amplitude of magnitude () by Agnieszka Kryszczyńska in May 1999. In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a sidereal period hours, as well as two spin axes at (46.0°, 48.0°) and (231.0°, 60.0°) in ecliptic coordinates (λ, β). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Tanina measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively. The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.1508 from Petr Pravec's revised WISE data, and takes a diameter of 14.67 kilometers based on an absolute magnitude of 11.84. Alternative mean-diameter measurements published by the WISE team include () and () with corresponding albedos of () and (). 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 000825 Discoveries by Grigory Neujmin Named minor planets 000825 000825 19160327