The Principal Galaxies Catalogue (PGC) is an astronomical catalogue that contains all available primary information for each of the known galaxies: morphological type, major and minor axes, magnitude, radial velocity and position angle. An astronomical catalog is a list or tabulation of astronomical objects, typically grouped together because they share a common type, morphology, origin, means of detection, or method of discovery. ... NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light years in diameter and approximately 60 million light years distant. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... Radial velocity is the velocity of an object in the direction of the line of sight. ...
The PrincipalGalaxiesCatalogue (PGC) is an astronomical catalogue that contains all available primary information for each of the known galaxies: morphological type, major and minor axes, magnitude, radial velocity and position angle.
PGC info at ESO's archive of astronomical catalogues
This page was last modified 09:42, 28 December 2005.
Because of such a lack of previous attention the majority of the IC identified galaxies have not been examined since they were originally discovered between the years 1888 and 1908 and therefore it has not been clearly established whether all such identities are valid as nonstellar objects.
Indeed even for the relatively few IC galaxy identities found in many of the modern catalogues the diversity of opinions as to their character or type is extensive, some catalogues listing a particular IC identity as being a galaxy while another catalogue describes this same identity as being a single or double star.
Each of these prints were examined for every IC identified galaxy contained within their 6.5 X 6.5 degrees of field and the results compared with the historical and modern identity data.
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