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An illustration of light sources from magnitude 1 to 3.5, in 0.5 increments. In astronomy, magnitude is a measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus. Magnitude values do not have a unit.
The Caldwell catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier catalogue .
Print/export Download as PDF; ... This is a compilation of symbols commonly used in astronomy, particularly professional astronomy. ... - Absolute magnitude, ...
"Astronomy: Star Atlases, Charts, and Maps", a collection of more than 60 star atlas volumes. "Astronomy: Selected Images , a collection of high-resolution star map images. "History of Cosmology: Views of the Stars" , high-resolution scans of prints relating to the study of the structure of the cosmos.
Download as PDF; Printable version; In other projects ... In astronomy, absolute magnitude (M) ... from 0.12 in the cloud-free case to 0.76 in the case of altostratus ...
The absolute magnitude M, of a star or astronomical object is defined as the apparent magnitude it would have as seen from a distance of 10 parsecs (33 ly). The absolute magnitude of the Sun is 4.83 in the V band (visual), 4.68 in the Gaia satellite's G band (green) and 5.48 in the B band (blue).
The astronomical catalogue is composed mainly of star clusters, nebulae, and galaxies. Other objects in the catalogue can be found in the other subpages of the list of NGC objects . The constellation information in these tables is from The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer , [ 1 ...
A star catalogue is an astronomical catalogue that lists stars. In astronomy , many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, and this article covers only some of the more frequently quoted ones.