Apparent Magnitude

1. Star A appears to be brighter than star B. There are 2 possible reasons. What are they?

2. According to Hipparchus, what is the apparent of a star which is just barely visible to the naked eye?

3. Find out the apparent magnitude of the following     a) Deneb    b) Dubhe    c) Sirius    d) Rigel    e) The Sun    f) Mars in opposition

4. If star A has an apparent magnitude of 1 and star B has an apparent magnitude of 2 then star A is 2.51 x brighter than star B. What is this ratio called?

5. To calculate how many times brighter a star would appear compared to another you can use the expression (2.51)^x where x is the difference between their apparent magnitudes. (You should only get a question where the difference is a whole number.)

Complete this table