Ian, I am intrigued by this thread - Nova Pup 2007 was missed and later estimated to have 'gone up' on June 5 2007, using extrapolated data from ESA's XMM-Newton telescope which picked up the x-ray signal on 9 Oct 2007. It was in a very different position though, not far from Naos.
It's an extraordinary coincidence, a year to the day apart, two novae in the same constellation with exactly the same story. I don't have subscriptions for IAUCs or CBETS, and I've been waiting for something to come up on IAU or AAVSO (nothing yet). This is OK, but in your initial post you say "The actual date (and magnitude) is back extrapolated from x-ray observations on October 2007". Is there some confusion here?
Cheers -
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