Dictionary of Nomenclature of Celestial Objects
(Last update: 17-Mar-2023)

Result of query: info cati PN YM$

Details on Acronym:   YM
  
YM     (Yerkes McDonald obs.)
 Write:<<PN YM  NN>>
 N:  47
Object:PN  (SIMBAD class: PlanetaryNeb = Planetary Nebula)
  Note:See also [J55] and [J56]
   Ref:=1955ApJ...121..604J
     byJOHNSON H.M.

 Astrophys. J., 121, 604-610 (1955)

    Symmetric galactic nebulae.

oTable 1: <[J55] NNN> (Nos 1-152), among which 36 are cross-id. with    <PN YM NN> (Nos 1-36)
   Ref:=1956ApJ...124...90J
     byJOHNSON H.M.

 Astrophys. J., 124, 90-92 (1956)

    Symmetric galactic nebulae. II.

oTable 1: <[J56] NN> (Nos 1-32), among which 11 are cross-id. with <PN    YM NN> (Nos 37-47)
 Originof the Acronym: A = Assigned by the author(s)