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It is about 9, I would guess..
AAVSO charts have comparison stars around nova ranging from 11.5 to 8.2 (visual), so this estimate is very rough.. I will try better with what I have in CdC (Hipparcos data)
EDIT:
8.9, compared to nearby stars from Tycho_2 catalogue.
This estimate was done on stack (8 frames, in DSS) with help of Iris (Aperture photometry (3rings), magnitude constant determined as 24.03).
Last edited by bojan; 09-12-2008 at 03:58 PM.
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