Lightcurve results for Asteroid 1575 Winifred.
No reliable period could be derived.
Asteroid 1575 Winifred is a main belt asteroid that was discovered by R. C. Cameron at Brooklyn, on 20 April, 1950. The semi-major axis is 2.15 AU and the eccentricity is 0.179 and the inclination is 10.72 degrees.
I observed this asteroid on 1 night during June 2005. No period could be determined.