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[vsnet-history 852] SN 1993J new data (Yamaoka, sci.astro)




Date: Wed, 28 Apr 93 11:02:28 JST
From: Yamaoka Hitoshi <yamaoka@kyu-ge.ec.kyushu-u.ac.jp>

From: rw@ourania.Princeton.EDU (Ralph A.M.J. Wijers)
Newsgroups: sci.astro
Subject: SN1993J magnitudes
Date: 26 Apr 93 15:26:36 GMT
Organization: Princeton University
Originator: news@nimaster
Nntp-Posting-Host: ourania.princeton.edu

Dear supernova fans,

A while ago, I promised to post a list of supernova magnitudes
in exchange for everyone sending me their results. The time
has come, but because the list contains some 700 data points
now, or a total of over 100 kbytes, I have made it available
on anonymous ftp rather than post it here. To get it,
ftp to astro.princeton.edu, login as ftp, and go to
subdirectory rw/sn. There you will find the file 1993j.mag,
which contains the data and an explanation of the meanings
of the various columns.
   If you cannot, for some reason, use ftp from your site,
please contact me by email and I will send you the file. The file
will be regularly updated.
   As to the supernova's behaviour: it is fading in all wavelength
bands now, except probably the infrared and radio. Still, the
number of measurements I have been getting is fading much more rapidly
than the brightness. Please, hang in there! Your measurements may be
important, and in a few weeks it will be too faint for most small
telescopes.

Ralph Wijers
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Newsgroups: sci.astro
From: rw@ourania.Princeton.EDU (Ralph A.M.J. Wijers)
Subject: Re: SN1993J magnitudes
Originator: news@nimaster
Nntp-Posting-Host: ourania.princeton.edu
Organization: Princeton University
Date: Mon, 26 Apr 1993 20:22:15 GMT

*************** ALERT ****************

For all of you who make visual estimates of the supernova and
who do not get the IAU circulars:

One of the comparison stars people have been using frequently
has been reported to be variable, probably with a period less than 1 day.
The star is Northwest of the M81 (3' West 12' North). It is
designated 10.7, doubly underlined on the Thomson-Bryan charts, 
and is designed D on the AAVSO/The Astronomer/BAA charts.

the variation is reported to have an amplitude of about 0.35 mag,
quite significant. So don't use it anymore, and please let me know 
of observations that you have reported in which this star was used. 
If you used multiple stars, and can still revise your estimate
to exclude this star, please do. Otherwise, at least notify us
so we know there is an additional uncertainty. If you want, you can
send us your Argelander estimates that use the star, so we could re-compute 
your estimate if the light curve of the varying star turns out to be
sufficiently predictable.

Ralph Wijers
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Newsgroups: sci.astro
From: wgd@se.houston.geoquest.slb.com (Bill Dillon)
Subject: Visual Magnitude Estimate of SN 1993J
Summary: It's fading... 
Keywords: Supernova, 1993J, M81, NGC 3031
Nntp-Posting-Host: brahms.se.houston.geoquest.slb.com
Organization: GeoQuest Systems Inc. Houston
Date: Tue, 27 Apr 93 13:52:55 GMT


On April 27.17, I estimated SN 1993J's magnitude at 11.5, using comparison
stars of magnitudes 11.4 and 11.9 (from the new AAVSO "e" chart for NGC 3031).
A 28 cm SCT was used for the observation.

Bill

___________________________________________________________________________
                      |                                                    |
Schlumberger GeoQuest |  "It's a fine art to disagree without being        |
5858 Westheimer       |                                disagreeable."      |
Suite 800             |                                                    |
Houston, TX  77057    |  "A good theory does not explain all the data,     |
_________________________________for some of the data are surely wrong."__ |

 --- 8< --- 8< --- 8< --- 8< --- 8< ---
Newsgroups: sci.astro
From: andromed@Hail.ATM.Dal.Ca (Mike Boschat)
Subject: SN 1993J Photometric obs...Crimea (old USSR)
Nntp-Posting-Host: hail.atm.dal.ca
Organization: ATM, Dalhousie University, Halifax, NS, Canada
Date: Tue, 27 Apr 1993 18:40:49 GMT

Hello;

 Received this photometric data from the USSR? whatever..it was sent to 
me since we are  in contact now, thanks to those who helped me to contact
them..thanks...hope this is helpful to some netters at observatories or
amateurs with photometric devices to comapare.
                                                 Mike
JONH F.KENNEDY ASTRONOMICAL OBSERVATORY
=============================================================================

Organization: Crimean Astrophysical Observatory
From:	shakh%crao.crimea.ua@relay.USSR.EU.net (Nikolay Shakhovskoy)
Date:	Tue, 27 Apr 1993 10:47:17 -0300
Subject: Supernova in M81
To: Mike Boschat
From: N.M.Shakhovskoy

  Dear Mike Boschat,
  Now I can communicate the next results of UBVRI photometry of Supernova
in M81 (see Table). Observation is continueing; new photometric data and
results of polarization measurements I will send later.
                                    Sincerely, N.Shakovskoy

                         SUPERNOVA 1993J in M81

                   UBVRI (Johnson) Photometric Observation
            1.25 m Telescope Crimean Astrophysical Observatory

 Date      J.D.     U     B     V     R     I     U-B   B-V   V-R   R-I  Rem.
 1993      2449+
04 10.86  088.357 11.72 11.84 11.30 10.85 10.66  -0.12  0.54  0.46  0.19  2,3
04 13.81  091.314 11.48 11.58 11.02 10.60 10.45  -0.10  0.56  0.43  0.15  1
04 16.86  094.363 11.54 11.61 10.95 10.48 10.37  -0.06  0.65  0.47  0.12  2,3
04 19.87  097.368 11.70 11.69 11.20 10.38 10.27   0.16  0.49  0.81  0.11  2,3
04 22.78  100.288 12.01 11.88 10.98 10.44 10.24   0.13  0.90  0.54  0.20  1
04 23.85  101.346 12.53 12.26 11.23 10.53 10.43   0.27  1.03  0.70  0.11  1
04 24.75  102.250 12.75 12.42 11.31 10.60 10.46   0.34  1.10  0.72  0.14  1
04 25.75  103.252 12.99 12.57 11.41 11.70 10.50   0.42  1.16  0.71  0.20  1
04 26.76  104.255 13.22 12.73 11.51 10.74 10.55   0.49  1.22  0.77  0.19  1

           Compar. st: RA=09 55 04.3; D=+68 54 05.7 (J2000)
04 22.78  100.28   9.09  9.10  8.58  8.18  7.88  -0.01  0.52  0.40  0.36  1

 Remarks:                            Observers: N.M.Shakhovskoy
 1 - Photometric mode                           Yu.S.Efimov
 2 - Polarimetric mode
 3 - Sometimes light clouds


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