Lang and I conceived of and started to work out a project to build an all-sky astrometric catalog out of the original USNO-B imaging catalogs and the 2MASS catalog, all tied to Tycho. This would be the first step towards our first Astrometry.net astrometric catalog. This would also be a first shot at doing source matching at the catalog level, a subject about which we have been talking for half a year. The first order of business, we realized, is to make a conceptual data model and a scalar objective function.
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