View source for Photographic Magnitude

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'''Photographic Magnitude'''
pg</sub>)</strong> 
</dt><BR/>Stellar [[Magnitudes|magnitudes]] 
measured from a photographic plate exposed without filters. 
</dd><BR/>''Photographic plates are more sensitive to short wavelengths than the 
human eye. The zero point of the photographic magnitude scale is such that 
photographic (m<sub>pg</sub>) and visual (m<sub>v</sub>) magnitudes are the same for stars of class A0 
of magnitudes between 5.5 and 6.5. Photovisual magnitudes (m<sub>pv</sub>) are measured from plates exposed through 
filters which hold back blue and violet thus giving magnitudes in the plate 
which closely approximate visual magnitudes (m<sub>v</sub>). ''[[/a>|/a>
]]
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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