The General Catalogue of Variable Stars lists it as a possible semiregular variable star with a period of 180 days and a photographic magnitude range of 8.9-10.0.
12.
The varying brightness of VY Cma was not described until 1931 when it was listed ( in German ) as a long period variable with a photographic magnitude range of 9.5-11.5.
13.
On the photographic plates taken between 1960 and 1977, the star is seen to vary irregularly between photographic magnitude 16.5 and 17.8, with quiescent periods in 1960-1961 and 1974 onwards.
14.
List of galaxies says that the Morphological Catalogue of Galaxies, which lists 30, 642, is putatively complete to a photographic magnitude of 15 . talk ) 13 : 03, 10 December 2016 ( UTC)
15.
The following year, a supernova within M87 reached a peak photographic magnitude of 21.5, although this event was not reported until photographic plates were examined by the Russian astronomer Innokentii A . Balanowski in 1922.
16.
For example, the human eye is more sensitive to yellow and red light than to blue, and photographic film more to blue than to yellow / red, giving different values of visual magnitude and photographic magnitude.
17.
In 1924, it was described as " P Cygni class " and recorded at photographic magnitude 9.5 In 1925, its absolute magnitude was estimated at " 8.9 . In 1933 it was listed as a 9th magnitude Beq star with bright hydrogen lines.
18.
The first attempts at systematic catalogues of galaxies were made in the 1960s the Catalogue of Galaxies and Clusters of Galaxies listing 29, 418 galaxies and galaxy clusters, and with the Morphological Catalogue of Galaxies, a putatively complete "'list of galaxies "'with photographic magnitude above 15 comprising 30, 642 items.
19.
In 1896, Cannon became a member of " Pickering s Women ", a group of women hired by Harvard Observatory director Edward C . Pickering to complete the Henry Draper Catalogue, with the goal of mapping and defining every star in the sky to a photographic magnitude of about 9 . In her notes, she referred to brightness as " Int " which was short for " intensity ".
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