# Magnitudes of stars

1. Mar 10, 2008

Can anyone help me get my head around this one?
A star with a parallax angle of pi = 10 millisecs and has apparant magnitude of V= 10.2
How can I determine absolute magnitude:
I have the formula M=v -5logd -5 +A which can be ignored.
d=1/pi but I am always determining d which is less than that of the sun's distance!
Thanks Red

2. Mar 10, 2008

### AstroRoyale

10 m'' = .010" , $$d=\frac{1}{p''}$$, where d is the distance in parsecs. Solve for d. This should probably be in the homework section.

Last edited: Mar 10, 2008