David Dunlap Observatory Catalog
(DDO)
(catalog of dwarf galaxies)
The David Dunlap Observatory Catalog is a 1950s catalog
of dwarf galaxies from observations at David Dunlap Observatory.
The observatory is north of Toronto, Canada, and houses a 1.9-meter
reflector telescope dating from 1935, which is currently used
for education.
The catalog introduced an enhanced galaxy type system that includes
a luminosity class analogous to the existing stellar
luminosity classes, each including a subsequent Roman numeral,
I, II, etc. Note that as a galaxy luminosity class, V
indicates a typical dwarf galaxy luminosity. The term
DDO classification refers to this Roman-numerical classification system,
or to a specific galaxy's classification as given by the catalog.
(catalog,galaxies)
Further reading:
https://en.wikipedia.org/wiki/David_Dunlap_Observatory_Catalogue
https://en.wikipedia.org/wiki/David_Dunlap_Observatory
http://astro-canada.ca/l_observatoire_david_dunlap-the_david_dunlap_observatory-eng
https://rascto.ca/content/david-dunlap-observatory-ddo
http://www.astro.utoronto.ca/AALibrary/pubs/DDOpubv2n5.pdf
https://ui.adsabs.harvard.edu/abs/1966AJ.....71..922V/abstract
https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095703978
Referenced by pages:
galaxy classification
van den Bergh galaxy classification
Wolf-Lundmark-Melotte (WLM)
Index