[15] The dark X-type asteroid has a notably long rotation period of 93.7 hours and measures approximately 70 kilometers (43 miles) in diameter.

[2] Sundmania is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.

[15] This minor planet was named after Finnish mathematician Karl F. Sundman (1873–1949), who intensively worked on the n-body problem.

[16] In 2016, an international study modeled a lightcurve with a period of 94.537±0.005 hours and found two spin axes of (51.0°, 76.0°) and (275.0°, 58.0°) in ecliptic coordinates (λ, β).

[5][6][7][8][9][10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0426 and a diameter of 70.56 kilometers based on an absolute magnitude of 9.8.