It was discovered on 17 February 1925, by Soviet astronomer Vladimir Albitsky at the Simeiz Observatory on the Crimean peninsula.
[12][13][14] Analysis of the best-rated lightcurve by American photometrist Robert Stephens at the Santana Observatory (646) from April 2005, gave a rotation period of 9.67 hours with a brightness amplitude of 0.16 magnitude (U=3).
[1][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, Spiridonia measures between 50.73 and 78.496 kilometers in diameter and its surface has an albedo between 0.029 and 0.06.
[5][6][7][8][9][10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0580 and a diameter of 55.17 kilometers based on an absolute magnitude of 10.0.
[2] The official naming citation was published by the Minor Planet Center on 15 July 1968 (M.P.C.