a well-defined rotation period of hours with a brightness variation of magnitude (). James Folberth and colleges of the Rose-Hulman Institute of Technology previously observed this asteroid at Oakley Southern Sky Observatory in August 2011, finding a period of hours with an amplitude of magnitude (). In November 2017, Tom Polakis at the Command Module Observatory in Tempe, Arizona, determined hours with an amplitude of magnitude (). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, Subamara measures and kilometers in diameter and its surface has an albedo of and , respectively. An earlier published measurement by the WISE team gives larger mean-diameter of and an albedo of . The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony S-type asteroid of 0.20 and calculates a diameter of 20.56 kilometers based on an absolute magnitude of 10.8. 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 000964 Discoveries by Johann Palisa Named minor planets 19211027