Richard E. Schmidt (2017). In 2017, a modeled lightcurve gave a concurring sidereal period of hours as well as a spin axis of (223.0°, −41.0°) in ecliptic coordinates (λ, β). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Ara measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively. Alternative mean-diameters published by the WISE team include () and () with corresponding albedos of () and (). In 2009 and 2015, several asteroid occultations of Ara were observed. The two best-rated observations from January 2009 and April 2015 and August 2008, gave a best-fit ellipse dimension of () and (), respectively. These timed observations are taken when the asteroid passes in front of a distant star. The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE albedo of 0.1149 and takes a diameter of 84.61 kilometers based on an absolute magnitude of 8.33, while Josef Ďurech calculates a diameter of by combining lightcurve inversion models with asteroid occultation silhouettes. 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 000849 Discoveries by Sergei Belyavsky Named minor planets 000849 19120209 vec:Lista de asteroidi#849 Ara