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UCAC5 provides mean positions and proper motions for over 107 million stars, derived from a new astrometric reduction of US Naval Observatory all-sky observations. The catalog combines UCAC5 data with Gaia DR1 to achieve typical proper motion accuracies of 1 to 2 mas/yr for stars between 11th and 15th magnitude. This dataset is hosted by NASA and was last updated in March 2026.
License is listed as 'other-license-specified'; specific terms should be reviewed before use. Data is available in BIN and HTML formats.