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 --- 8< --- 8< --- 8< --- 8< --- 8< --- 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 --- 8< --- 8< --- 8< --- 8< --- 8< --- 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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