# Norman Robert Pogson

Norman Robert Pogson (March 23rd 1829 - June 23rd 1891) was a British Astronome .

He had been born with Nottingham in England. Before the 18 years age, it had calculated the orbits of two Comet S.

He became assistant with the Observatoire Radcliffe with Oxford in England in 1851. In 1860 it went to Madras in India, becoming the astronomer of the local government. With the Observatory of Madras, it carried out the Catalog of Madras including/understanding 11015 star S. It also discovered five there Astéroïde S and six variable stars.

Its most notable contribution was to notice that in the system of Magnitude connect introduced by the Greek astronomer Hipparque, the stars first magnitude were approximately hundred times more brilliant than those sixth magnitude. It suggested in 1856 making a standard of it, of such kind that each fall a magnitude represents a fall of luminosity equal to the root fifth of 100 (either approximately 2,512). The Rapport of Pogson became the method standardized to allot the magnitudes.

The relation magnitudes is the following one:

$m_ \left\{2\right\} - m_ \left\{1\right\} = -2.5 \ log_ \left\{10\right\} \left(L_2/L_1\right)$

where m is the apparent magnitude and L is the Luminosité, for the stars 1 and 2 .

In 1868 and 1871, Pogson took part in Indian forwardings of observation of solar eclipses S.

During its career, he on the whole discovered eight asteroids and 21 variable stars. He directed the observatory of Madras during 30 years until his death.

## Honorary distinctions

the following celestial objects are named according to him:
• the asteroid (1830) Pogson
• the crater Pogson on the the Moon

## References

• Magnitudes off Thirty-six off the Minor Planets for the first day off each month off the year 1857, NR. Pogson, MNRAS 17 p 12 1856 into which Pogson introduced for the first time its system magnitude.

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