It was discovered on 25 June 1924, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany.

[12] Thomana orbits the Sun in the outer main-belt at a distance of 2.8–3.5 AU once every 5 years and 8 months (2,058 days).

[1] Between 2006 and 2009, three rotational lightcurves of Thomana were obtained from photometric observations by astronomers James W. Brinsfield, Pierre Antonini as well as René Roy and Laurent Bernasconi.

[8][9] In 2016, an international study modeled a lightcurve from various data sources with a period of 17.5611 hours and found two spin axis of (86.0°, −65.0°) and (272.0°, −42.0°), respectively, in ecliptic coordinates (λ, β) (Q=n.a.).

[4][5][6][7] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0649 and a diameter of 58.27 kilometers based on an absolute magnitude of 9.76.