astronomer Federico Manzini at SAS observatory in Novara, Jean Strajnic and Raoul Behrend from December 2012, which rendered a period of hours with an amplitude of 0.66 in magnitude (). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer (WISE), the asteroid measures 4.0 km in diameter and its surface has an exceptionally high albedo of 0.81, for which WISE assigns an E-type. The Collaborative Asteroid Lightcurve Link assumes a lower, yet still high albedo of 0.40 and hence calculates a larger diameter of 5.7 kilometers, as the lower the albedo, the larger the body's diameter for a constant absolute magnitude. References External links Lightcurve plot of 2001 Einstein, Palmer Divide Observatory, B. D. Warner (2012) 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 002001 Discoveries by Paul Wild (Swiss astronomer) Named minor planets 2001 002001 002001 19730305