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2001 Einstein
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=== 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 [[astronomical albedo|albedo]] of 0.81, for which WISE assigns an [[E-type asteroid|E-type]].<ref name="WISE" /> 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.<ref name="lcdb" />
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