[Aavso-photometry] Errors on AIP

[Pertti Pääkkönen]

On Wednesday 14 July 2004 23:17, Radu Corlan wrote:
> > Finally, yeah, I'm not sure how to integrate the read noise into the
> > noise equation. I'm just adding it in quadrature now. Otherwise the
> > noise equation makes sense to me.
>
> To integrate read noise, you need to take into account your aperture; each
> pixel contributes read noise.

...and photon noise from background, readout noise in your bias, dark and flat 
frames, scintillation, etc. as discussed in Radu's link. Too complicated, I'm 
afraid most observers (me too sometimes) just send their observations without 
considering the uncertainties too much.

I do hope that some of AIP developers follow this discussion and implement a 
proper SNR/Uncertainty estimate calculation (and astrometry as wel). 
Meanwhile, it might be reasonable to use STD of your check star for your 
uncertainty estimate.

Pertti

-- 
Pertti Pääkkönen, Ph.D, Laboratory Engineer
University of Joensuu
Department of Physics
tel:    +358 13 251 3238
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