Dictionary of Nomenclature of Celestial Objects

 e.    See also VHK for the V*.
 in source:M 33 = NGC 598
   Ref:=1926ApJ....63..236H
     byHUBBLE E.P.

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

    A spiral nebula as a stellar system: Messier 33.

o[H26] acronym is not used for the V*, the numbering is continued in    1975ApJS...29..303V, all V* are 'VHK NN' in SIMBAD.
o<VHK NN> (Nos 1-45). <[H26] AN> (Nos N1, N2).

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