Cepheid variable is a star which is used to calculate distances from around 1kpc to 50 Mpc. The absolute visual magnitude is the measure of celestial variable's intrinsic brightness. It can be calculated from the known pulsation period.
Cepheid variable is a star which is used to calculate distances from around 1kpc to 50 Mpc. The absolute visual magnitude is the measure of celestial variable's intrinsic brightness. It can be calculated from the known pulsation period.