![]() Measurements show 1st magnitude stars are 100x as bright as 6th.Dimmest stars visible to unaided eye = Magnitude 6.Brightest stars visible to unaided eye = Magnitude 1.Greeks (Hipparchus) established scale calledĪpparent magnitude is a measure of Brightness Often expressed relative to the sun's luminosity (L SUN).Knowing Brightness and Distance, we can determine Luminosity.This depends on how far away the object is by the.The brightness that the star appears to have to an observer on the Earth Total rate at which radiative energy is given off by a celestial body Dwarf (comparable to or smaller than the Sun).Supergiants (100-1000 times the Sun's radius).look again at the radius trends on the plot of the "main sequence" of the.The above equation can be rearranged to derive an equation for the radius: ![]() That is, type O has a radius 1000 times the radius of type M Represents an increased area, or a radius increase of 1,000
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