Dictionary of Nomenclature of Celestial Objects
(Last update: 24-Jan-2023)

Result of query: info cati M51]$

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).