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magnitude system

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magnitude system [′mag·nə‚tüd ‚sis·təm]
(astronomy)
A system for designating the relative brightness of stars when photography is used; emulsions of different color sensitivities, used with color filters, permit measurements of starlight of different wavelengths with corresponding determination of magnitude at these wavelengths.


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If we wish to combine measurements with those of other observers, it is often necessary to measure the small differences between our own telescope/CCD/filter system and the standard filter passbands, in order to correct or transform measurements to a standard magnitude system (in this case Johnson V).
All objects have been placed on a scale relating to their brightness,or luminosity,known as the magnitude system.
Today the magnitude system is based on photometry, and it seems a little confusing that a higher magnitude number means a dimmer object, but that is the custom.
 
 
 
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