French amateur astronomer René Roy obtained a rotational lightcurve from photometric observations in October 2007. It gave a rotation period of 7.2298 hours with a brightness variation of 0.54 magnitude (U=2+), superseding observations by Brazilian Cláudia Angeli and by the Spanish ECLA project, which both gave a period of 7 hours with an amplitude of 0.57 and 0.4 magnitude, respectively (U=1/2).[a]
Diameter and albedo
According to the survey carried out by the Japanese Akari satellite, the asteroid measures 14.9 kilometers in diameter and its surface has an albedo of 0.156, while two different data sets from NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission give a diameter of 12.1 and 12.9 kilometers with an albedo of 0.269 and 0.304, respectively.
The Collaborative Asteroid Lightcurve Link agrees with the results obtained by Akari, assuming a standard albedo for stony asteroids of 0.20 and calculating a diameter of 14.9 kilometers with an absolute magnitude of 11.5.
This minor planet is named "Sootiya" which means "star boy" in the language of the Hopi Tribe of northern Arizona. Correspondingly, the Vestian asteroid 2432 Soomana stands for "star girl". Naming citation was proposed by Michael Lomatewama and Ekkehart Malotki and published on 8 February 1982 (M.P.C. 6650).