calibration with a mixture model

Foreman-Mackey and I worked on his mixture model for photometric calibration of the heterogeneous runs that make up SDSS Stripe 82. The mixture model is a mixture of variable and non-variable stars, and for each of those, the observations are a mixture of good observations and bad observations; it is a mixture of mixtures, with a lot of degeneracies. But it seems to do a great job of getting the zeropoints, and he successfully recovers the known RR Lyrae stars in the Stripe. Can we find new ones? That is the question for this month.