Caldwell Catalog
(small catalog for amateur astronomers as an adjunct to the Messier Catalog)
The Caldwell Catalog was assembled in the 1990s
with 109 diffuse objects that are not in the
Messier Catalog but are just as easily viewed by amateur astronomers.
Amateur astronomers use the Messier Catalog as a list of bright,
easily-seen galaxies, globular clusters and nebulae
for potential viewing,
but Messier's actual goal was to list those that could be confused
with comets, skipping some easily-seen diffuse objects
that were unlikely to be mistaken for comets.
(catalog,galaxies,nebulae)
Further reading:
https://en.wikipedia.org/wiki/Caldwell_catalog
http://astropixels.com/caldwell/caldwellcat.html
https://www-kpno.kpno.noirlab.edu/Info/Caches/Catalogs/Caldwell/caldwell.html
Referenced by pages:
Centaurus A
IC 342
NGC 3132
NGC 3201
Index