Why Is Star Magnitude?

Magnitude, in astronomy, measure of the brightness of a star or other celestial body. The brighter the object, the lower the number assigned as a magnitude. ... One magnitude is defined as a ratio of brightness of 2.512 times; e.g., a star of magnitude 5.0 is 2.512 times as bright as one of magnitude 6.0.

Why do stars have different magnitude?

For example, a magnitude 1 star is exactly 100 times brighter than a magnitude 6 star. ... The apparent magnitude (m) is the brightness of an object as it appears in the night sky from Earth. Apparent magnitude depends on an object's intrinsic luminosity, its distance, and the extinction reducing its brightness.

Is there a magnitude star?

According to this ancient scale, the brightest stars in our sky are 1st magnitude, and the very dimmest stars to the eye alone are 6th magnitude. A 2nd-magnitude star is still modesty bright but fainter than a 1st-magnitude star, and a 5th-magnitude star is still pretty faint but brighter than a 6th-magnitude star.