NGC 2000.0 Corrections

Some minor corrections to the original NGC 2000.0 have been included in our online database:

NGC 1904 = M79 was found by the author to be inacurate in NGC 2000.0, and corrected from 05:24.5 -24:33 to 05:24.2 -24:31. Source of error to be researched.
NGC 2171 is a star cloud in LMC, not a Galaxy.
NGC 2287 = M41 position was corrected from RA 6:47.0 to 6:46.0; thanks to M. Ferrio for reporting this error (probably by Dreyer)
NGC 2736 was erroneously classified as a galaxy, while it is actually a nebula and part of the Vela Supernova Remnant.
NGC 2818, a planetary nebula in an open cluster (NGC 2818A), was erroneously described as a globular cluster in NGC 2000.0 - probably a reading error during the compilation process of the NGC 2000.0, caused by the similarity of the symbols. Thanks to Louis Marchesi for pointing us to this error! We now follow the various descriptions and have the planetary nebula as NGC 2818 = GC 1801 = h 3154A = Dun 564A (= PK 261+08.1, He2-23, ESO 372-13), and the open cluster as NGC 2818A = GC 1801A = h 3154 = Dun 564.
NGC 5408 is a galaxy not a planetary nebula.
NGC 5844 is a planetary nebula.
NGC 6164 and NGC 6165 are parts of a WR-like ejecta nebula, not a planetary nebula.
NGC 6380, RA corrected from erroneous 17:35.4 to correct 17:34.5
NGC 6540, classified as an Open Cluster in the NGC 2000.0, has been identified with the Globular Cluster Djorg 3 or Djorgowsky 3 (Bica et.al. 1994).
NGC 6811, open cluster in Cygnus, is actually at a slightly different position and larger than in the NGC 2000.0; position shifted from RA 19:38.2, Dec +46:34 to RA 19:37.3, Dec +46:23, size increased from 13' to 15'. Thanks to Wolfgang Renz for this update!
NGC 6857 is an H II region not a
NGC 6941 is a Galaxy not a Globular Cluster.
NGC 7076 is PN Abell 75.
IC 1257 has been identified as Globular Cluster (Harris et.al. 1997). Thanks to Barbara Wilson for communicating this to us!
IC 1266 is planetary nebula TC 1.
IC 3601 has some dubious fame for being classified as "Photographic Plate Defect" in NGC 2000.0, based on a finding by Dorothy Calson (1940), who classifies this object as not found, and "a defect on the plate where it was originally found by Frost, Harvard Annals 88" (Frost 985). However, as found by Malcolm J. Thomson (2005), there is a galaxy in Frost's position (later cataloged e.g. as PGC 165275, VPC 1124, and [DCY96] 345), which is now considered as IC 3601.
IC 4334 is a galaxy not a planetary nebula.
IC 4543 is a galaxy not a planetary nebula.
IC 4599 is a planetary nebula.
IC 4670 is a planetary nebula.
IC 4677, discovered by Barnard in 1900, has been listed as a galaxy, but is apparently just the brightest knot in the halo of famous planetary nebula NGC 6543.
IC 4723 is a galaxy not a planetary nebula.

References

E. Bica, S. Ortolani, and B. Barbuy, 1994. The globular cluster NGC 6540. Astronomy and Astrophysics, vol. 283, no. 1, pp. 67-75 (03/1994) [ADS: 1994A&A...283...67B]
Dorothy Carlson, 1940. Some Corrections to Dreyer's Catalogues of Nebulae and Clusters. Astrophysical Journal, Vol. 91, pp. 350-359 [ADS: 1940ApJ....91..350C]
William E. Harris, Randy L. Phelps, Barry F. Madore, Olga Pevunova, and Brian A. Skiff, 1997. IC 1257: A New Globular Cluster in the Galactic Halo. Astronomical Journal, Vol 113, p. 688 (Feb 1997) [ADS: 1997AJ....113..688H].
Malcolm J. Thomson, 2005. IC Research Database: The Survey - List of Corrections. Disponsible en ligne.

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