Magnitude (astronomy)

Apparent Magnitude , the apparent brightness of an object. For example, Alpha Centauri has higher apparent magnitude (i.e. lower value) than Betelgeuse , because it is much closer to the Earth .

Absolute Magnitude , which measures the Luminosity of an object (or reflected light for non-luminous objects like Asteroid s); it is the object's apparent magnitude as seen from certain location. For Star s it is 10 Parsec s (32.6 Light Year s). Betelgeuse has much higher absolute magnitude than Alpha Centauri, because it is much more luminous.

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