[Aavso-photometry] xform question

[Michael Koppelman]

If I call the slope term 'm' and the intercept term 'b' (and dropping 
airmass for now) you could also write this equation as:

Vstd-Vins = b + m*(B-V)

m and b are both things that I calculate when I calculate my 
transformation coefficients. Then I also calculate a zeropoint for the 
night (call this zp). The way I have been applying my transformation 
the equation looks like this:

Vstd-Vins = zp + m*(B-V)

My question being: the b that I calculate with my transforms is not 
really ever used, right? I always use the nightly zeropoint and never 
the averaged intercept coefficients.

Thanks!
Michael

On Dec 11, 2004, at 12:40 PM, Arne Henden wrote:

> Michael, zeropoint and intercept are related.  If you look at
> a typical transformation equation,
>   Vstd-Vins = zeropoint + extinction*airmass + coeff*(B-V)