Dictionary of Nomenclature of Celestial Objects

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S 147, a wellknown galactic SNR, should be labelled Sim 147. S instead of Sh 2- (HII region, Sharpless, ref. 1959ApJS....4..257S) is of current use, except in eastern Europa where it generally stands for Sim (HII region, Shajn+Gaze, ref. 1950IzKry...6....3S).
Ref:=1953ApJ...118..362S
bySHARPLESS S.
 Astrophys. J., 118, 362-369 (1953)
  A catalogue of emission nebulae near the galactic plane.
o<Sh 1-NNN> (Nos 1-142), Superseded by Sh 2-NNN
Ref:=1959ApJS....4..257S
bySHARPLESS S.
 Astrophys. J., Suppl. Ser., 4, 257-279 (1959)
  A catalogue of HII regions.
oTable 1: <Sh 2-NNN> (Nos 1-313)
=E=Catalogue in electronic form as VII/20

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