Photographic magnitude
Before the advent of photometers which accurately measure the brightness of astronomical objects, the apparent magnitude of an object was obtained by taking a picture of it with a camera. These images, made on orthochromatic photoemulsive film or plates, were more sensitive to the blue end of the visual spectrum than the human eye or modern photometers. As a result, bluer stars have a lower (i.e. brighter) photographic magnitude than their modern visual magnitude, because they appear brighter on the photograph than they do to modern photometers. Conversely, redder stars have a higher (i.e. fainter) photographic magnitude than visual magnitude, because they appear dimmer. For example, the red supergiant star KW Sagittarii has a photographic magnitude of 11.0 to 13.2 but a visual magnitude o
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Photographic magnitude
Before the advent of photometers which accurately measure the brightness of astronomical objects, the apparent magnitude of an object was obtained by taking a picture of it with a camera. These images, made on orthochromatic photoemulsive film or plates, were more sensitive to the blue end of the visual spectrum than the human eye or modern photometers. As a result, bluer stars have a lower (i.e. brighter) photographic magnitude than their modern visual magnitude, because they appear brighter on the photograph than they do to modern photometers. Conversely, redder stars have a higher (i.e. fainter) photographic magnitude than visual magnitude, because they appear dimmer. For example, the red supergiant star KW Sagittarii has a photographic magnitude of 11.0 to 13.2 but a visual magnitude o
has abstract
Antes do advento dos fotômetro ...... ualmente considerada obsoleta.
@pt
Avant l'apparition des photomè ...... ant considérée comme obsolète.
@fr
Before the advent of photomete ...... le is now considered obsolete.
@en
In astronomia la magnitudine f ...... nsiderata una misura obsoleta.
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Фотографическая звёздная велич ...... ографических она равна 425 нм.
@ru
写真等級(Photographic magnitude)は、 ...... 真視等級の記号は、mpg、写真絶対等級の記号はMpgである。
@ja
攝影星等是以傳統的乾版或底片拍攝得到的星等。 在光度計出現之 ...... ，絕對攝影星等的符號是Mpg。 攝影星等現在被認為是過時的。
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Wikipage page ID
Wikipage revision ID
727,541,596
subject
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Antes do advento dos fotômetro ...... a estrela supergigante vermel
@pt
Avant l'apparition des photomè ...... elle, parce qu'elles apparaiss
@fr
Before the advent of photomete ...... 13.2 but a visual magnitude o
@en
In astronomia la magnitudine f ...... oggi. Per esempio, la supergig
@it
Фотографическая звёздная велич ...... называется показателем цвета.
@ru
写真等級(Photographic magnitude)は、 ...... 真視等級の記号は、mpg、写真絶対等級の記号はMpgである。
@ja
攝影星等是以傳統的乾版或底片拍攝得到的星等。 在光度計出現之 ...... ，絕對攝影星等的符號是Mpg。 攝影星等現在被認為是過時的。
@zh
label
Magnitude fotográfica
@pt
Magnitude photographique
@fr
Magnitudine fotografica
@it
Photographic magnitude
@en
Фотографическая звёздная величина
@ru
写真等級
@ja
攝影星等
@zh