Norman Robert Pogson ( born Norman Robert Pogson , March 23, 1829 , Nottingham June 23, 1891 ) is an English astronomer.
| Norman Robert Pogson | |
|---|---|
| Norman Robert Pogson | |
| Date of Birth | March 23, 1829 |
| Place of Birth | Nottingham |
| Date of death | June 23, 1891 (62 years old) |
| A place of death | |
| A country | United Kingdom |
| Scientific field | astronomy |
| Place of work | Radcliffe Observatory , Madras Observatory |
| Awards and prizes | Lalande Prize of the Paris Academy of Sciences ( 1856 ) |
| Open Asteroids : 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) Faith | February 6, 1885 |
At the age of 18, he calculated the orbits of two comets . From 1850 to 1851 he worked at the Bishop Observatory . In 1851 became a research fellow at the Redcliffe Observatory in Oxford , England. In 1860 he moved to Madras , India , where he took up the position of state astronomer. At the Madras Observatory published a catalog of 11,015 stars. Also discovered there are five asteroids and six variable stars .
He was especially noted for his observation that in the system of visible stellar magnitudes introduced by the Greek astronomer Hipparchus , stars of the first magnitude are about a hundred times brighter than stars of the sixth magnitude. In 1856, he proposed taking such a position as a standard so that each magnitude reduction represented a decrease in brightness equal to the fifth root of 100 (or about 2.512). Pogson's ratio has become the standard method for estimating magnitude.
The brightness ratio is represented by the following formula:
where m is the magnitude and L is the luminosity for stars 1 and 2 .
In 1868 and 1871, Pogson participated in Indian expeditions to observe the solar eclipse .
In total, Pogson discovered eight asteroids and 21 variable stars during his career. He headed the Madras Observatory for 30 years, until his death.
Content
- 1 memory
- 2 See also
- 3 Literature
- 4 References
Memory
- Asteroid (1830) Pogson .
- Pogson Crater on the Moon.
See also
- Norman Thomas
- C. G. F. Peters
- J. Heny
Literature
- Kolchinsky I.G., Korsun A.A., Rodriguez M.G. Astronomers: A Biographical Reference. - 2nd ed., Revised. and additional .. - Kiev: Naukova Dumka, 1986. - 512 p.
Links
- Norman Robert Pogson - Irineu Gomes Varella (Portuguese)
- Magnitudes of Thirty-six of the Minor Planets for the first day of each month of the year 1857 , N. Pogson, MNRAS 17 pp 12 1856 in which Pogson first introduced his magnitude system