|
Essay Archive - Stars
Stars
The magnitude scale was invented by an ancient Greek astronomer named Hipparchus
in about 150 BC He ranked the stars he could see in terms of their brightness,
with 1 representing the brightest down to 6 representing the faintest. Modern
astronomy has extended this system to stars brighter than Hipparchus' 1st
magnitude stars and ones much, much fainter than 6.
As it turns out, the eye senses brightness logarithmically, so each increase in
5 magnitudes corresponds to a decrease in brightness by a factor 100. The
absolute magnitude is the magnitude the stars would have if viewed from a
distance of 10 parsecs or some 32.6 light years. Obviously, Deneb is....
|
