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945,592,683 stars out to magnitude 21 are cataloged in the GSC-II. This photometric data was compiled to support the Hubble Space Telescope with targeting off-axis stars. The catalog is provided by the National Aeronautics and Space Administration and was last updated in March 2026.
License is listed as 'other-license-specified'; terms should be reviewed before use. Data is in a BIN file format.