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Date: Mon, 19 Apr 93 20:46:42 JST
From: Hitoshi Yamaoka <g78261a@kyu-cc.cc.kyushu-u.ac.jp>
Date: Mon, 19 Apr 93 07:27:26 EDT
From: David Kratz <kratz@aquila.larc.nasa.gov>
To: g78261a@kyu-cc.cc.kyushu-u.ac.jp
Status: R
Hitoshi:
Here are my observations to date on SN1993J. To me, SN1993J has
``stabilized'' at a magnitude between the magnitude 10.7 comparison star and
either component of the magnitude 10.4/10.5 double star. Previously unreported
observations are marked with asterisk(*).
Dave
Date Time (UT) Telescope Eyepiece comparison *'s mag estimate
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4/2 1:00 8"/f3.5 TVP 10.5+paracorr a = d > b > c > SN > e 10.6
4/4 2:00 8"/f3.5 TVP 10.5+paracorr a = d > b > c > e > SN 10.8
4/8 0:45 8"/f3.5 TVP 10.5+paracorr a > e > SN > f > h 11.5
4/13 1:00 8"/f3.5 TVP 10.5+paracorr a = d > b > c > SN > e 10.6
4/14 0:45 8"/f3.5 TVP 10.5+paracorr a = d > b > c > SN > e 10.6
4/18* 0:45 8"/f3.5 TVP 10.5+paracorr a = d > b > c > SN > e 10.6
4/19* 1:30 8"/f3.5 TVP 10.5+paracorr a = d > b > c > SN > e 10.6
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The 8"/f3.5 in combination with the 10.5 millimeter TeleVue Plossl & the
paracorr coma corrector yields 79 power.
Comparison stars:
star mag. position from center of M81 on supernova chart by Thompson & Bryan
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a) 10.3 11.8' West 0.3' South
b) 10.4 3.3' West 7.2' South
c) 10.5 3.7' West 7.2' South
d) 10.3 12.4' East 7.5' South
e) 10.7 4.5' West 9.7' North
f) 11.8 4.2' West 2.0' North
g) 11.9 0.3' East 3.5' South
h) 12.4 5.5' West 2.1' South
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