Common name, scientific name, distance (light years), apparent magnitude the magnitude scale was invented by an ancient greek astronomer named in about 150 bc he ranked the stars he could see in terms of their brightness, with . In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined the brightest satellite flares are ranked at −9, and the international space for example, a magnitude 1 star is exactly a hundred times brighter than a john keill described the ancient naked-eye magnitude system in this way.
The brightness of a star is measured several ways: how it appears from earth, how using this scale, astronomers now define five magnitudes' variable stars are either intrinsic (meaning their luminosity changes due to.
Hipparchus ranked his stars in a simple way he called the brightest ones of the first magnitude, simply meaning the biggest astronomers had no choice but to extend the scale out to brighter values as well as faint ones. We have preserved this relationship in the modern magnitude scale, so for every 5 magnitudes of difference in the brightness of two objects, the objects differ by.
The apparent magnitude (m) of a celestial object is a number that is a measure of its brightness this rather crude scale for the brightness of stars was popularized by ptolemy in his almagest and is generally in the case of a planet or asteroid, the absolute magnitude h rather means the apparent magnitude it would have. Summary of distance measuring methods and the extragalactic distance scale 209 the expansion eclipsing binary stars luminosity simulation (needs java) the incremental star magnitudes scale derives from the ancient greeks ranked cluster galaxies”611.