SIMBAD references

1926ApJ....63..236H - Astrophys. J., 63, 236-274 (1926)

A spiral nebula as a stellar system: Messier 33.

HUBBLE E.P.

Journal keyword(s):

Nomenclature: VHK NN (Nos 1-45). [H26] AN (Nos N1, N2).

CDS comments: [H26] acronym is not used for the V*, the numbering is continued in 1975ApJS...29..303V, all V* are 'VHK NN' in SIMBAD.

Simbad objects: 40

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