Dictionary of Nomenclature of Celestial Objects

W is West or East, the second is North or South. O for Offset, NN and NNN are X and Y coordinates, in arcsec. with the center of NGC 7331 as origin.
in source:NGC 7331
Ref:=1994A&A...282..363M
byMARCELIN M. , PETROSIAN A.R., AMRAM P., BOULESTEIX J.
 Astron. Astrophys., 282, 363-368 (1994)
  The HII regions and the velocity field of NGC 7331.
o<[MPA94] WONNWNNN> N=13

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