[4][16] Alemannia is a non-family asteroid from the main belt's background population.
[11] The best-rated photometric lightcurve observations gave a rotation period of 4.671 hours with a brightness amplitude between 0.20 and 0.33 magnitude (U=3),[12] superseding previous observations that gave a period of 5.82 and 4.68 hours, respectively.
[14][13] According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Alemannia measures between 32.98 and 45.448 kilometers in diameter and its surface has an albedo between 0.1057 and 0.201.
[6][8][9][10][11] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1878 and a diameter of 34.1 kilometers based on an absolute magnitude of 9.77.
[7][8] This minor planet was named for the student fraternity Alemannia in Heidelberg, Germany.