Siril Spectrophotometric Catalog extracted from Gaia DR3 (uncompressed for random access)

This is an extract of the Gaia DR3 catalog optimized for spectrophotometric color calibration. The catalog is indexed at HEALpix level 8 and selects up to the 127 brightest sources in each level 8 HEALpixel, though in many HEALpixels the number is limited by the Gaia sources that have xp_sampled records available. However this strategy ensures an even density of stars, providing sufficient stars for color calibration while avoiding overpopulation of the catalog in densely populated regions of the sky.

This catalog is developed for use with the Siril 1.4 series.

The catalog is a variant of https://doi.org/10.5281/zenodo.14697692 provided as 48 uncompressed data files, each covering a level 1 HEALpixel indicated by the final number in the filename. This variant of the catalogue is intended for random access using HTTP RANGE requests, with data offsets and ranges computed in accordance with https://doi.org/10.5281/zenodo.14697486