Historically-aware NGC/IC Positions and Notes


Here are current versions of my NGC/IC position and notes files. I update these at irregular intervals, so check back occasionally for more recent files. Latest updates:

  • Positions: 19 January 2011
  • Notes: 19 January 2011
  • What's here:

  • Introduction to the Positions files.
  • Comments about the Mean Positions.
  • Raw equinox B1950.0 positions for the NGC objects.
  • Raw equinox B1950.0 positions for the IC objects.
  • Unweighted mean positions for the NGC objects, equinox B1950.0.
  • Unweighted mean positions for the IC objects, equinox B1950.0.
  • Unweighted mean positions for the NGC objects, precessed to equinox J2000.0.
  • Unweighted mean positions for the IC objects, precessed to equinox J2000.0.

  • Introduction to the Notes files.
  • Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual.
  • Notes on the IC objects, particularly those missing, misidentified, or otherwise unusual.
  • This current file layout still carries some historical baggage. I started the project decades ago on computers with small and slow RAM and hard drives, so working with short files was more efficient. I've at least concatenated the Notes and Position files; if you need the original files as I still work on them, go to the Miscellaneous Files directory off my home page.

    All the files are 7-bit ASCII, by the way, with UNIX line-endings.

    You are welcomed to use the Positions and Notes in any way you like, but please do acknowledge their origin.

    Page last updated 29 March 2011.