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How come there´s more NGC objects labeled in the SDSS index images than shown in The Night Sky Atlas?

April 26, 2017images index labeled ngc Night objects SDSS

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How come there´s more NGC objects labeled in the SDSS index images than shown in The Night Sky Atlas?

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The NGC objects shown in The Night Sky Atlas are limited to the brightest 4 in each constellation in order to somewhat distribute them throughout the sky. This restriction was removed in creating the SDSS index images to locate all NGC objects within the SDSS survey area.