Norman Robert Pogson

Norman Robert Pogson (March 23, 1829 – June 23, 1891) was a British astronomer who worked in Oxford and in Chennai, India (formerly Madras).

In 1856 he formalized the system of stellar magnitudes, by defining magnitudes logarithmically and fixing a difference of five magnitudes as corresponding to a hundred-fold difference in brightness.

A lunar crater is named after him, and so is the asteroid 1830 Pogson.

Asteroids discovered: 8
42 Isis	May 23 1856
43 Ariadne	April 15 1857
46 Hestia	August 16 1857
67 Asia	April 17 1861
80 Sappho	May 2 1864
87 Sylvia	May 16 1866
107 Camilla	November 17 1868
245 Vera	February 6 1885

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