fitting images with Gaussians

Foreman-Mackey and I worked away at doing Gaussian-aperture (or Gaussian-model) photometry on the output of Traditional Lucky Imaging and The Thresher, both acting on some of Bianco's fast imaging data. We went around in circles a bit with bad optimization, but we can now measure the point-spread function width and the signal-to-noise of point sources in the final data products. In the morning, I worked on improving Lang and my mixture-of-Gaussian approximations to the SDSS galaxy profiles that we use in The Tractor, in part to help out Kevin Bundy, who is using them in preparation for MANGA data. Gaussians rock!