Then, after canceling the constants, we arrive at the luminosity equation: You can also use this tool as an absolute magnitude calculator. It is related to brightness, which is the luminosity of an object in a given spectral region. If two stars have the same surface area, the hotter one will give off more radiation. Since we have calculated the luminosity, we can calculate the absolute magnitude with this formula: Absolute Magnitude = 4.83 ⚊2.5 • … The apparent brightness is how much energy is coming from thestar per square meter per second, as measured on Earth. Since magnitude is socommonly used, we need to understand a little about it too. Executables for Windows and Macintosh computers are available for all of our older projects (NAAP, ClassAction, & Ranking Tasks). Absolute magnitude is a different way to measure the luminosity. We can calculate the star’s luminosity – relative to the sun’s – with the following equation, whereby L = luminosity and R = radius: L = R 2 L = 4 2 = 4 x 4 = 16 times the sun’s luminosity ' Fill in either the star absolute magnitude or the apparent magnitude. You can find it with the apparent magnitude calculator, using the following equation: The absolute magnitude is defined as the apparent magnitude of an object seen from the distance of 10 parsecs. The appropriate package for your (or your student's) computer system must be downloaded and installed locally. Apparent magnitude, on the other hand, is a measure of brightness when the star is seen from Earth - hence, it takes into account the distance between the star and the Earth. 3 3.5 = 46.8. It depends on both the radius of the star and on its surface temperature. If you fill in absolute magnitude, then luminosity can be calculated without a need for the luminosity distance. The lower the absolute magnitude, the more luminous the star is - some very bright stars can even have negative magnitudes! window.jQuery || document.write('