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(1993 May 19)
subject:BV photometry of SN1993J
Following photoelectric observations have been reported.
Forwarded message:
BV Photometry of SN1993J
Nobuo OHKURA
SENOH Observatory, 25 senoh, Okayama, Okayama,702 Japan
and
Osamu OHSHIMA
BISEI Observatory, Ohkura,Bisei,Okayama,714-14 Japan
Site of observation: SENOH Observatory
Telescope : Celestron 14inch + x1.4 forcal extender
Photometer: Photon counter produced by Advanced Engneering Service Corp.
PMT: HAMAMATSU R647-04 (Bi-alkali cathord)
Filter: V band Schot GG14(2mm)
B band Schot GG13(2mm)+BG12(1mm)
Integration Time: 30 sec.
Reduction made:
Dead time correction
First-order and Second-order extinction corrections
Transformation to the UBV standard system
Transformation coefficients: EPS=-0.069, MU=1.145
Comparison star: Star B as V=11.90, B-V=0.50
Check star: Star A
Position of sky background: 1 arcmin east of the each stars
Hel.J.D. V p.e. B-V p.e. n Object
2449083.170 11.93+/-0.05 0.45+/-0.06 4 SN
.178 11.48 0.01 0.58 0.03 2 star A
2449086.146 11.70+/-0.02 0.41+/-0.02 4 SN
.150 11.57 0.02 0.47 0.07 2 star A
2449088.110 11.43+/-0.02 0.46+/-0.03 4 SN
.116 11.44 0.01 0.12 0.02 2 star A
2449095.037 11.12+/-0.02 0.39+/-0.01 4 SN
.041 11.47 0.01 0.56 0.02 2 star A
2449096.054 11.07+/-0.01 0.47+/-0.03 5 SN
.063 11.47 0.01 0.52 0.01 2 star A
2449097.037 11.46+/-0.02 0.91+/-0.02 5 SN
.044 11.44 0.01 0.66 0.08 2 star A
2449112.083 11.93+/-0.03 1.24+/-0.04 4 SN
.087 11.43 0.02 0.67 0.07 2 star A
2449122.066 12.22+/-0.01 1.24+/-0.01 2 SN
.070 11.45 0.48 1 star A
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