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Date: Fri, 11 Jun 93 12:21:53 JST
From: Hitoshi Yamaoka <g78261a@kyu-cc.cc.kyushu-u.ac.jp>
>From kratz@aquila.larc.nasa.gov Tue Jun 8 08:50 JST 1993
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Date: Mon, 7 Jun 93 15:23:03 EDT
From: David Kratz <kratz@aquila.larc.nasa.gov>
To: g78261a@kyu-cc.cc.kyushu-u.ac.jp
Hitoshi:
Here are my observations to date on SN1993J. The date marked with an
asterisk (*) is the previously unreported estimate. Please note that except
for 4/24 & 5/23 all observations are with my 20.3cm (8") f3.5 telescope.
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
4/30 1:00 8"/f3.5 TVP 10.5+paracorr SN = g 11.9
i > f > SN = g > h
5/8 2:00 8"/f3.5 TVP 10.5+paracorr f(1)g(4)SN(1)h 12.3
f > g > SN > h
5/11 1:45 8"/f3.5 TVP 10.5+paracorr i(1)g(1)SN = h 12.4
i > g > SN = h
5/23 2:00 12.5"f/6 K 24, TVP 13 h(1)SN(1)j 12.7
h > SN > k > j
5/28 2:15 8"/f3.5 TVP 10.5+paracorr h(1)SN(1)j 12.7
h > SN > k >j
5/31 2:00 8"/f3.5 TVP 10.5+paracorr h(2)SN(1)j 12.8
h > SN > k >j
6/2 2:00 8"/f3.5 TVP 10.5+paracorr h(2)SN(1)j 12.8
h > SN > k >j
6/7* 2:00 8"/f3.5 TVP 10.5+paracorr h(2)SN(1)j 12.8
h > SN > k >j
------------------------------------------------------------------------------
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, 4/30, 5/8, 5/11, 5/28, 5/31, 6/2 & 6/7.
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 & 5/23.
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"
j) 13.0 6.6' West 0.8' South Richmond star "E"
k) 12.9 6.8' East 2.7' North
-----------------------------------------------------------------------------
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