description Norman Pogson Overview
Norman Pogson was a British astronomer whose work helped establish the modern system for comparing the apparent brightness of stars. In 1856 he formalized the logarithmic stellar magnitude scale by defining a difference of five magnitudes as a brightness ratio of exactly 100, so one magnitude represents a factor of about 2.512. The Pogson relation remains a basic principle of astronomical photometry, in which lower numerical magnitudes indicate brighter objects.
help Norman Pogson FAQ
What did Norman Pogson contribute to astronomy?
Norman Pogson helped establish the modern system for comparing the apparent brightness of stars. In 1856 he formalized the logarithmic stellar magnitude scale.
What brightness ratio did Pogson define for five magnitudes?
Pogson defined a difference of five magnitudes as a brightness ratio of exactly 100. This relationship remains the basis of the astronomical magnitude system.
When did Norman Pogson formalize the stellar magnitude scale?
He formalized the logarithmic scale in 1856. The scale expresses brightness differences numerically rather than using a simple linear count.
Why is the astronomical magnitude scale logarithmic?
The logarithmic system reflects how large brightness differences can be represented compactly. Pogson's 1856 definition made five magnitudes equal to a 100-to-1 brightness ratio.
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