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- Q1322559 subject Q7139523.
- Q1322559 abstract "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 of about 8.5 to 11. It is also common for star charts to list a blue magnitude (B) such as with S Doradus and WZ Sagittae.The symbol for apparent photographic magnitude is mpg and the symbol for absolute photographic magnitude is Mpg.The photographic magnitude scale is now considered obsolete.".
- Q1322559 wikiPageWikiLink Q1138868.
- Q1322559 wikiPageWikiLink Q124313.
- Q1322559 wikiPageWikiLink Q133139.
- Q1322559 wikiPageWikiLink Q13565.
- Q1322559 wikiPageWikiLink Q1485994.
- Q1322559 wikiPageWikiLink Q159653.
- Q1322559 wikiPageWikiLink Q193599.
- Q1322559 wikiPageWikiLink Q2028919.
- Q1322559 wikiPageWikiLink Q2356324.
- Q1322559 wikiPageWikiLink Q282744.
- Q1322559 wikiPageWikiLink Q361124.
- Q1322559 wikiPageWikiLink Q430024.
- Q1322559 wikiPageWikiLink Q6293.
- Q1322559 wikiPageWikiLink Q690868.
- Q1322559 wikiPageWikiLink Q7139523.
- Q1322559 wikiPageWikiLink Q836972.
- Q1322559 comment "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.".
- Q1322559 label "Photographic magnitude".