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Date: Wed, 21 Jul 93 15:57:24 JST
From: Hitoshi Yamaoka <g78261a@kyu-cc.cc.kyushu-u.ac.jp>
>From kratz@aquila.larc.nasa.gov Tue Jul 20 21:48 JST 1993
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Date: Tue, 20 Jul 93 08:46:58 EDT
From: David Kratz <kratz@aquila.larc.nasa.gov>
To: g78261a@kyu-cc.cc.kyushu-u.ac.jp
Status: R
Hitoshi:
After nearly a month of hazy conditions, the skys over Virginia finally
cleared. Considering the recent magnitude estimates that had been reported for
SN1993J, I anticipated that the supernova would be beyond the light gathering
capability of my 8" (20.3 cm) telescope. I was therefore pleasantly surprised
when I pointed the telescope at M-81 and the supernova was still clearly
evident. I don't know how much longer I'll be able to monitor SN1993J (The
haze has already made a return), but I'll do my best.
Here are my observations to date on SN1993J. The date marked with an
asterisk (*) is the previously unreported estimate.
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 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
6/17 2:30 8"/f3.5 TVP 10.5+paracorr SN=k(1)j 12.9
h > SN = k > j
6/23 2:00 8"/f3.5 TVP 10.5+paracorr k(1)j(1)SN 13.1
h > k > j > SN
6/24 2:00 8"/f3.5 TVP 10.5+paracorr k(1)j(1)SN 13.1
h > k > j > SN
6/25 2:15 8"/f3.5 TVP 10.5+paracorr k(1)j(1)SN 13.1
h > k > j > SN
7/17* 2:45 8"/f3.5 TVP 10.5+paracorr h(3)j(2)SN 13.4
h > j > SN > l
------------------------------------------------------------------------------
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, 6/17, 6/23, 6/24, 6/25 & 7/10.
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
l) 13.6 3.0' East 8.7' South Richmond star "W"
-----------------------------------------------------------------------------
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