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Date: Fri, 30 Apr 93 12:44:43 JST
From: Hitoshi Yamaoka <g78261a@kyu-cc.cc.kyushu-u.ac.jp>
>From kratz@aquila.larc.nasa.gov Fri Apr 30 09:17 JST 1993
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Date: Thu, 29 Apr 93 08:14:06 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. The date marked with an
asterisks (*) is the previously unreported estimate. Thanks, for the
information on the possibility that star (e) might be variable. Since I
became aware of this, I have discontinued using it as a comparison star.
Please note that I have made no attempt to "correct" my estimates. I believe
that such an action would be terribly dangerous. As things are now, if a good
lightcurve is produced for star (e) then my estimates can be post-processed.
Dave Kratz
Date Time (UT) Telescope Eyepiece comparison *'s mag estimate
------------------------------------------------------------------------------
4/2 1:00 8"/f3.5 TVP 10.5+paracorr c(1)SN(1)e or a(3)SN(1)e 10.6
a = d > b > c > SN > e
4/4 2:00 8"/f3.5 TVP 10.5+paracorr a(4)e(1)SN 10.8
a = d > b > c > e > SN
4/8 0:45 8"/f3.5 TVP 10.5+paracorr SN(1)f(2)h or a(1)e(2)SN 11.5
a > e > SN > f > h
4/13 1:00 8"/f3.5 TVP 10.5+paracorr a(3)SN(1)e 10.6
a = d > b > c > SN > e
4/14 0:45 8"/f3.5 TVP 10.5+paracorr a(3)SN(1)e 10.6
a = d > b > c > SN > e
4/18 0:45 8"/f3.5 TVP 10.5+paracorr a(3)SN(1)e 10.6
a = d > b > c > SN > e
4/19 1:30 8"/f3.5 TVP 10.5+paracorr a(3)SN(1)e 10.6
a = d > b > c > SN > e
4/24 1:30 12.5"f/6 K 24, TVP 13 SN(3)f(1)g or i(1)SN(4)g 11.5
i > SN > f > g
4/28 1:00 8"/f3.5 TVP 10.5+paracorr SN = f 11.8
i > SN = f > g
4/29* 1:00 8"/f3.5 TVP 10.5+paracorr f = SN 11.8
i > f = SN > g > h
------------------------------------------------------------------------------
The 8"/f3.5 in combination with the 10.5 millimeter TeleVue Plossl & the
paracorr coma corrector yields 79 power. Observations made from Yorktown,
Battlefield, Virginia, USA on 4/2, 4/4, 4/8, 4/13, 4/14, 4/18, 4/19, 4/28
& 4/29.
The 12.5"f/6 in combination with the 24 millimeter Konig yields 76 power,
in combination with the 13 millimeter TeleVue Plossl yields 141 power.
Observation made from Ellicott City, Maryland, USA on 4/24.
Comparison stars:
star mag. position from center of M81 on supernova chart by Thompson & Bryan
------------------------------------------------------------------------------
a) 10.3 11.8' West 0.3' South
b) 10.4 3.3' West 7.2' South Richmond star "X" East component
c) 10.5 3.7' West 7.2' South Richmond star "X" West component
d) 10.3 12.4' East 7.5' South
e) 10.7 4.5' West 9.7' North Possibly variable by 0.35 mag???
f) 11.8 4.2' West 2.0' North Richmond star "G"
g) 11.9 0.3' East 3.5' South Richmond star "B"
h) 12.4 5.5' West 2.1' South Richmond star "D"
i) (11.4) 0.7' East 2.4' South Richmond star "A"
-----------------------------------------------------------------------------
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