Photographic Magnitude

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Photographic Magnitude pg</sub>)</strong> </dt>
Stellar magnitudes measured from a photographic plate exposed without filters. </dd>
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_pg) and visual (m_v) magnitudes are the same for stars of class A0 of magnitudes between 5.5 and 6.5. Photovisual magnitudes (m_pv) 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_v). [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use