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What (who) is USNO CCD Astrograph Catalog - definition
USNO CCD Astrograph Catalog
Le Catalogue astrographique CCD de l'USNO (en anglais : USNO CCD Astrograph Catalog, abrégé en UCAC) est un catalogue d'étoiles astrométrique publié par l'observatoire naval des États-Unis (USNO).
