[1] In September 2005, a rotational lightcurve of Astrid was obtained from photometric observations by French amateur astronomer René Roy.
[12] In October 2010, additional lightcurves were obtained at the Palomar Transient Factory in California, as well as by astronomers Eric Barbotin and Raoul Behrend, which gave a concurring period of 10.2 and 10.229 hours with an amplitude of 0.10 and 0.13 magnitude, respectively (U=1/2).
[12][13] According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Astrid measures between 33.28 and 52.48 kilometers in diameter and its surface has an albedo between 0.031 and 0.077.
[4][6][7][8][9][10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0644 and a diameter of 34.60 kilometers based on an absolute magnitude of 10.9.
This minor planet was named in memory of Astrid of Sweden (1905–1935), Queen consort of the Belgians, who died at the age of 29 in a car accident while on vacation in Switzerland.