Details on Acronym: [M51]
[M51] (Mayall, 1951)= ([M51a]) = (My) (Not yet in Simbad) Write:<<[M51] NNN>> N: 139 Object:? (SIMBAD class: Unknown = Object of Unknown Nature) Note:Observations with the 10-inch Metclaf telescope in South Africa of pecliar spectra objects.
Among then 6 are PN My. Ref:=1951BHarO.920...32M byMAYALL M.W. Harvard Bull., 920, 32-37 (1951) New peculiar spectra. oTable I: <[M51] NNN> (Nos 1-139) = <PN My NN> for (Nos 45, 47, 48, 56, 59, 60).
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