Ummm... never mind, we found it...(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

Given Proxima Centauri with parallax angle of 0.769" and apparent bolometric magnitude of 11.1... what is its absolute magnitude?

2. Relevant equations

I get that I should use m-M = 5 log10(d/10 pc) and I understand that d = 1/p".

What I really need to know is: what do I use to get apparent magnitude? After I get m I can plug and chug, and I'm fine with that... but how do I get m?

Apparent magnitude was not given and I can't look it up for a quiz or test.

3. The attempt at a solution

so far...

m-M = 5 log10 [(1/0.769)/10]

or M = m - 5 log10 (.1300)

But I'm still stuck on where to go for m...

Thanks!

Lori the Totally Lost English Major

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Calculating absolute magnitude and apparent magnitude

**Physics Forums | Science Articles, Homework Help, Discussion**