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I got this from Enrico Cappellaro.

 SN1992A     48640.50  12.56

According to Jeffery et al. (1992)
  Vmax=12.61\pm.05 on January 20.9\pm.5

    Therefore Julian Date=8622+.5+20.9-1.
                         =8642.4
    which looks about right.

  Bmax=12.6\pm.2 on January 19.2\pm1.0

    Therefore Julian Date=8622+.5+19.2-1.
                         =8640.7
    which looks about right.

  The Julian Date of explosion by the 18 day
  rule is 8622.7

Some points that don't fit the local trend can be 
 omitted.

    12.359   12.8100
   271.801   19.6800


    Date          V 
    from 
    explosion

END:
    10.801   13.2600
    11.801   13.0700
    12.359   12.8100
    12.801   12.9100
    13.359   12.7900
    13.801   12.7800
    14.332   12.7300
    14.801   12.7100
    15.332   12.6900
    15.801   12.6600
    16.332   12.6600
    16.801   12.6000
    17.801   12.5700
    18.801   12.5700
    19.801   12.5400
    20.801   12.5400
    21.801   12.5700
    22.801   12.6000
    23.801   12.6500
    24.801   12.7200
    25.801   12.7800
    26.801   12.8700
    27.801   12.9500
    28.801   13.0600
    29.801   13.1200
    30.801   13.1800
    31.801   13.2400
    32.801   13.3000
    33.801   13.3600
    33.871   13.4300
    34.801   13.4100
    35.801   13.4500
    37.801   13.5700
    39.801   13.7600
    50.801   14.5400
    51.801   14.5900
    52.801   14.6300
    54.801   14.7300
    55.801   14.7600
    57.801   14.7900
    64.801   14.9500
    68.801   15.1200
    69.332   15.1900
    70.801   15.1900
    74.801   15.3300
    78.801   15.3600
    89.801   15.6600
    93.801   15.8000
    96.801   15.8800
    97.801   15.9400
   107.801   16.2200
   108.801   16.2700
   207.223   18.2400
   245.102   18.6100
   271.801   19.6800    A poor Dutch value.
   296.039   19.6000
   334.000   19.9800
   335.930   20.0800
   356.941   20.2900
   388.852   20.6800
   388.852   20.7600
   422.840   21.2300
   423.801   21.2200
   450.840   21.4900
   943.801   25.9000