# How do you convert an observed magnitude to a flux? [duplicate]

For a series of supernovae I have the observed magnitude and I want to convert these values to flux.

I understand that I need to apply:

$$m - M_r = -2.5\log_{10} \frac{F}{F_r}$$

where $$M_r$$ is a 'reference magnitude' with corresponding known 'reference flux'.

What exactly should I use as my reference values?

• Very similar: astronomy.stackexchange.com/questions/13709/… – Sir Cumference Oct 29 '17 at 18:05
• Cheers buddy!!!! – Matt Hill Oct 29 '17 at 19:22
• @SirCumference Yet that original question does not use the term flux, which others may search for as a key term. Perhaps an answer is worthwhile here. – Cam_Aust Nov 2 '17 at 12:25
• As I understand the question, it sounds backwards. Usually one takes the flux measurements and uses a reference to determine the magnitude. – Mick Dec 1 '17 at 9:18