Barron and I played around with some ideas in two-dimensional density estimation with the idea being that we might be able to identify some of the spurious entries in the USNO-B Catalog that are not due to diffraction spikes and reflection halos. Barron coded up two ideas and both looked like they worked well. We aren't going to hold up our paper on USNO-B for this enhancement, but we might insert it into the Astrometry.net pipeline (which benefits enormously from a very clean USNO-B Catalog).
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