Astrophysics > 4. Determining Distance >
Solve problems and analyse information using 
and 
to calculate the absolute or apparent magnitude of stars using data and a reference star
- The distance modulus formula can be used to determine one of the variables of absolute magnitude, apparent magnitude and distance (in parsecs), when two of the other variables are known:
- The following formula can be used to determine the brightness ratio of two stars, or the apparent magnitude of one of the stars, when two of the other variables are known: