Statistics of Galaxies by Magnitude and Catalog

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Updated on May 12, 2003

I investigated the number of bright galaxies, which can be targets of amateur supernova survey, and the ratio of source catalogs of them. Some may think that most bright galaxies have NGC numbers. However, not a few bright galaxies do not have NGC numbers. Those with NGC numbers are 80% of all among galaxies brighter than 13 mag. The ratio goes down to 60% on galaxies brighter than 14 mag. Those with NGC numbers are only 30% of all among galaxies brighter than 15 mag. I investigated the number of magnitude of galaxies using: Catalogue of Principal Galaxies (PGC) Astronomical Data Center catalog No. 7119 Download: ftp://adc.gsfc.nasa.gov/pub/adc/archives/catalogs/7/7119/pgc.gz Mag. NGC IC UGC MCG PGC brighter than 10 38 2 0 3 5 brighter than 11 143 3 0 3 6 brighter than 12 450 21 8 11 15 brighter than 13 1293 104 45 63 68 brighter than 14 3062 468 432 641 451 brighter than 15 5130 1634 3507 4024 2705 brighter than 16 6110 3046 7787 12861 18601 Number of Galaxies IC excepting NGC UGC excepting NGC, IC MCG excepting NGC, IC, UGC PGC excepting NGC, IC, UGC, MCG