Index Catalogue (IC)
Two Index Catalogues (IC) were published as supplements to the New General Catalogue (NGC)1. They were compiled, as was the NGC, by John Dreyer. The first (IC I), published in 1895,2 added 1,529 new star clusters, nebulae, and galaxies; the second (IC II), published in 1908,3 listed a further 3,857 objects.
NGC 2000.0 is a modern compilation of the New General Catalogue, the Index Catalogue, and the Second Index Catalogue. It is intended to meet the needs of present-day observers by reporting positions at equinox 2000.0 and by incorporating the corrections reported by Dreyer himself and by many other astronomers who have worked with the data and compiled lists of errata.
Notable objects with IC designations include:
349 (Barnard's Merope Nebula)
IC 405 (Flaming Star Nebula)
IC 410 (nebula nearby the Flaming Star Nebula)
IC 434 (bright nebula around Horsehead Nebula)
IC 1396 (Garnet Star Nebula)
IC 2118 (Witch Head Nebula)
IC 2220 (Toby Jug Nebula)
IC 2574 (Coddington's Nebula)
IC 2602 (Southern Pleiades)
IC 4703 (Eagle Nebula)
IC 5070 (Pelican Nebula)
IC 5146 (Cocoon Nebula)
1. Dreyer, J. L. E. 1888, "New General Catalogue of Nebulae and Clusters
of Stars." Mem. Roy. Astron. Soc., Vol. 49, Part I. Reprinted
1953, London, Royal Astronomical Society. NGC.
2. Dreyer, J. L. E. 1895, "Index Catalogue of Nebulae Found in the Years 1888 to 1894, with Notes and Corrections to the New General Catalogue." Mem. Roy. Astron. Soc., Vol. 51, p. 185. Reprinted 1953, London, Royal Astronomical Society. IC I, IC 1-1529.
3. Dreyer, J. L. E. 1908, "Second Index Catalogue of Nebulae Found in the Years 1895 to 1907; with Notes and Corrections to the New General Catalogue and to the Index Catalogue for 1888 to 1894." Mem. Roy. Astron. Soc., Vol. 59, Part 2, p. 105. Reprinted 1953, London, Royal Astronomical Society. IC II, IC 1530-5386.