Editing New General Catalogue (section)

==''Index Catalogue''==
{{See also|List of IC objects|Category:IC objects}}
The first major update to the NGC is the ''Index Catalogue of Nebulae and Clusters of Stars'' (abbreviated as ''IC''), published in two parts by Dreyer in 1895 (IC I,<ref>
{{cite journal
 |last=Dreyer |first=J. L. E.
 |date=1895
 |title=Index Catalogue of Nebulae found in the years 1888 to 1894, with Notes and Corrections to the New General Catalogue
 |journal=[[Memoirs of the Royal Astronomical Society]]
 |volume=51 |pages=185–228
 |bibcode=1895MmRAS..51..185D
}}</ref> containing 1,520 objects) and 1908 (IC II,<ref>
{{cite journal
 |last=Dreyer |first=J. L. E.
 |date=1910
 |title=Second Index Catalogue of Nebulae and Clusters of Stars; containing objects found in the years 1895 to 1907, with Notes and Corrections to the New General Catalogue and to the Index Catalogue for 1888–94
 |url=https://archive.org/download/secondindexcatal00dreyrich/secondindexcatal00dreyrich.pdf
 |journal=[[Memoirs of the Royal Astronomical Society]]
 |volume=59 |pages=105–198
 |bibcode=1910MmRAS..59..105D
}}</ref> containing 3,866 objects). It serves as a [[supplement (publishing)|supplement]] to the NGC, and contains an additional 5,386 objects, collectively known as the IC objects. It summarizes the discoveries of galaxies, clusters and nebulae between 1888 and 1907, most of them made possible by [[photography]]. A list of corrections to the IC was published in 1912.<ref>
{{cite journal
 |last=Dreyer |first=J. L. E.
 |date=1912
 |title=Corrections to the New General Catalogue resulting from the revision of Sir William Herschel's Three Catalogues of Nebulae
 |journal=[[Monthly Notices of the Royal Astronomical Society]]
 |volume=73 |pages=37–40
 |bibcode=1912MNRAS..73...37D
 |doi=10.1093/mnras/73.1.37
|doi-access=free
 }}</ref>