This dimension names the astronomical catalogue in which a celestial object is formally listed. Wikipedia defines such a catalogue as "a list or tabulation of astronomical objects, typically grouped together because they share a common type, morphology, origin, means of detection, or method of discovery." Browsing this way collects every object recorded in the same catalogue.
Facts
Comparison
Field Origin Era Catalogue
Sources
1. Wikipedia: Stellar classification
Wikimedia FoundationStellar classification, History section, 1901 Cannon sentenceQuote, Stellar classification, History section, 1901 Cannon sentence
In 1901, Annie Jump Cannon returned to the lettered types, but dropped all letters except O, B, A, F, G, K, M, and N used in that order, as well as P for planetary nebulae and Q for some peculiar spectra.
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