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My brightness estimates based on studies of all pictures available.
Brightness calculation ( How to. )
M33nova2001-1 ( Distance 2.5 million light years )
Absolute peak brightness ( x Sun ) : 65000
Peak brightness ( 17.1 ): 17.208 Nov 2001
Half brightness : Approx. 30 Nov 2001
Number of days : Approx. 13
Source : Images on David Bishop's M33_2001_1 Sub page
Reference stars, USNO-A2.0 Rmags
