What does IC mean in astronomy?
…it was supplemented by two Index Catalogues (IC) of 5,386 additional objects. The list still included galaxies as well as true nebulae, for they were often at this time still indistinguishable. Most of the brighter galaxies are still identified by their NGC or IC numbers according to their listing in…
How many objects are there in NGC catalog?
7,840 objects
The NGC contains 7,840 objects, and there are 990 prime numbers within that range. By far, most are galaxies. The fewest of any type — five — are planetary nebulae.
How many IC objects are there?
5,386 objects
It serves as a 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.
Who created the New General Catalogue?
Johan Ludvig Emil Dreyer
It was compiled in 1888 by Danish astronomer Johan Ludvig Emil Dreyer, who based his work on earlier lists made by the Herschel family of British astronomers. Dreyer included 7,840 celestial objects, a total raised to 13,226 by his first and second Index Catalogues (IC), published in 1895 and 1908, respectively.
What does M NGC and IC mean?
NGC, M and IC. What do they mean? These letters are abbreviations for astronomical catalogues of known stars, nebulae, supernova remnants, galaxies and other objects in space. Most of these new objects were discovered by photography.
How do you read an NGC number?
Also appearing on each NGC grading label is that particular coin’s identification number. This consists of six (or more recently, seven) digits followed by a dash and three more digits. The first sequence of numbers is taken from the pre-printed invoice number under which the coins were submitted.
What does IC mean in galaxies?
The Index Catalogue (IC) lists an additional 5,286 galaxies, nebulae, and star clusters discovered between 1888 and 1907.
What does M mean in the Milky Way galaxy?
Messier objects
These letters are abbreviations for astronomical catalogues—published lists of known stars, nebulae, supernova remnants, galaxies, and other objects in space. Names with the letter M are Messier objects, named after Charles Messier, a French astronomer.
Where can I find the NGC and IC catalogs?
Wolfgang Steinicke’s NGC/IC site, including the Revised NGC and IC Catalog. The NGC/IC Project maintains an online database of various versions of the NGC and IC catalogs and related material, including an interactive observing list generator. Note in particular the scanned online versions of the NGC and IC catalogs.
What is the NGC/IC Project?
The NGC/IC Project maintains an online database of various versions of the NGC and IC catalogs and related material, including an interactive observing list generator. Note in particular the scanned online versions of the NGC and IC catalogs.
What does NGC stand for?
NGC 2000.0 is a modern compilation of the New General Catalogue of Nebulae and Clusters of Stars (NGC), the Index Catalogue (IC), and the Second Index Catalogue compiled by J. L. E. Dreyer (1888, 1895, 1908).
What is the galactic latitude column in NGC/IC?
The Galactic Latitude of the NGC/IC object. This column contains a reference code that indicates the source of the modern data about the object that were used in NGC 2000.0. “Modern” data may include types, positions, sizes, and magnitudes, but not the descriptions, which are always those of Dreyer.