Brightness estimates based on
studies of all pictures available.


31.Oct 2000 = Julian day ( JD ) 2451848.5
Brightness calculation ( How to. )

( Ignore Rmags - sign )
Mova M31_2000_4 ( 2.3*10^6 l.y. )

Absolute peak brightness ( x Sun ) : 38*10^3 Peak(?) brightness : JD 51851 Half brightness : JD 51856 (?) Number of days : 5 (?) Source : Images on David Bishop's M31_2000_4 Sub page Reference stars, USNO-A2.0 Rmags

Main Astronomical Index ( bottom ).