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Association of Bangalore Amateur Astronomers

ABAA NEWS: Discussions on Magnitude system.

6 Sep 2012, 11:08 UTC
ABAA NEWS: Discussions on Magnitude system.
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Every Sunday evenings there are discussions on astronomy topics at ABAA, Here is a summary of discussion that took place in the middle of August. The discussion was on Magnitude system.Apparent magnitude Members had discussion on Magnitude system in astronomy. Starting with Apparent magnitude, the brightness of stars as seen from earth. Hipparchus, Greek astronomer grouped the brightest stars as first magnitude, little fainter stars became second magnitude, and the faintest star eye could see as sixth magnitude. The difference in brightness from one magnitude is 2.512times, that makes 1st magnitude star is 100time brighter than 6th magnitude star. Sirius (brightest star) -1.5 Venus (at brightest) -4.4 Full Moon -12.6 The Sun -26.8 Faintest naked eye stars 6 Uranus 5.7 Neptune 8 Pluto 14 In magnitude system, negative is brighter and positive is fainter. As negative number increases the brightness increases, for example our sun has apparent magnitude of -26.8 making it brightest and Uranus has apparent magnitude of +5.7 which is fainter. Absolute Magnitude:Apperant magnitude are brightness of stars as seen from earth irrespective of distances. The brightness of stars, the magnitude they appear when placed at a constant distance is called Absolute magnitude. The magnitude that stars will ...

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