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abstraction > data collection > astronomical catalog > catalog about star systems > galaxy catalog

galaxy catalog
subject			fact

galaxy catalog	has object type galaxy or nebula (some nebulae are misidentified as galaxies)
	is a kind of catalog about star systems

Kinds of galaxy catalog :

• quasar catalog (2 facts)
• Shane-Wirtanen catalog (2 facts) - A catalog of all galaxies brighter than seventeenth magnitude (a measure of brightness). There are about a million galaxies in the Shane-Wirtanen catalogue.
• Shapley-Ames catalog (2 facts) - A catalog of galaxies brighter than thirteenth magnitude, completed in 1932. There are about 1200 galaxies in this catalogue.