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[vsnet-history 1145] SN 1993J (Kratz - Yamaoka)




Date: Fri, 18 Jun 93 13:33:28 JST
From: Hitoshi Yamaoka <g78261a@kyu-cc.cc.kyushu-u.ac.jp>

>From kratz@aquila.larc.nasa.gov Thu Jun 17 21:36 JST 1993
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Date: Thu, 17 Jun 93 08:35:15 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 
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 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
6/17*   2:30      8"/f3.5    TVP 10.5+paracorr  SN=k(1)j                  12.9
                                                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 & 6/17.

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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