These are light curves constructed from analysis of CCD Images taken by the Meade LX200 30 cm and SBIG ST9E CCD camera at Sunflower Observatory in Olathe, Kansas.
Typical procedure used is to take 2 to 3 minute guided exposures using MPO Connections software developed by Brian Warner. The images are usually spaced at intervals of five minutes from start time to start time.
The images are flat fielded then analyzed using MPO Canopus and its photometry tools. The light curve that results is the best fit of the data to a typical bimodal asteroid light curve assuming a triaxial ellipsoid shape.