Respuesta :
Once a distant Cepheid's period has been established, its brightness can be calculated using the known characteristics of Cepheid variations.
Following a relationship between its absolute magnitude and apparent magnitude using the distance modulus equation, its distance can be calculated. The Cepheid variable is one of a family of variable stars whose periods—i.e., the length of one cycle of variation—are closely correlated with their luminosities and are thus useful in determining the distances between stars and between galaxies. Compared to a maximum distance of roughly 65 light years for parallax measurements taken from Earth and a little over 100 pc (326 light years) for the Hipparcos space-based instrument, Cepheid variations can be observed and measured out to a distance of about 20 million light years.
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