The last very bright supernova in the Milky was occurred in 1604. Estimates of how frequently such supernova are visible - on average - disagree by a factor of a few, but one per century is not far from the mark. So our recent experience with accurately measuring Nova Del 2013 - which peaked at the faint end of naked eye visibility - suggests a few things:
- the AAVSO *can* play a very important role - even the most important role - in obtaining calibrated photometry of very bright objects.
- we need to seriously plan and prepare if we are to have a hope of measuring a really bright transient accurately!
By the time such a supernova occurs, it will be too late to work out the wrinkles. If you think saturation and comp stars are an issue at mag 5, try mag -4!
Just a thought!