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(1993 Apr. 3)
subject: SN1993J photometry
Sir Dr. de Vaucouleurs,
Here is the content of our first CCD photometry. Further B,V,I
CCD images were taken at Ouda (Kyoto University) tonight and are
now awaiting for analysis.
M. Okyudo (Nishiharima Observatory, Hyogo, Japan) obtained following
differential photometry of SN1993J using 0.6-m reflector + CCD.
The color band is Johnson V (uncalibrated, but the color system is
very close to the standard V).
1993 Apr. 1.660 UT SN - star A = -0.18
He also confirmed that relative magnitudes between A,B and C are
in pretty good agreement (within 0.01 mag) with those by Michael Richmond.
One may conclude that
a) Ignoring the systematic difference, the SN faded by 0.51 mag
since Richmond's observations.
b) No evidence of variability was found among the comparison stars.
Regards,
Taichi Kato (Kyoto University)
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