modeling for precision

Jay Anderson (STScI) gave the colloquium at OCIW today. He showed the incredible precision he can get in astrometry, proper motions, and photometry with HST when he models the image pixels directly, as we advocate. His color–magnitude diagrams for globular clusters are simply incredible. As is his astrometric precision (few percent of a pixel) for point sources, despite the fact that the images are only barely sampled. The science is good and the engineering is sweet.

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