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IAUC 5783: 1993M; 1993J

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                                                  Circular No. 5783
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     J. Maza, University of Chile; and M. Hamuy, Cerro Tololo
Interamerican Observatory, report the discovery of an apparent
supernova of mpg about 18.5 by R. Antezana (University of Chile) on a
20-min unfiltered IIa-O plate taken by G. Valladares with the CTIO
Curtis Schmidt telescope on Apr. 28.33 UT.  The new object is
located 1" west and 3" south of the nucleus of a galaxy at R.A. =
19h08m16s, Decl. = -64 22'29" (equinox 1950.0).  Confirmation of SN
1993M was made by R. Aviles on CCD B, V, and I images obtained on
May 2.279 with the CTIO 0.9-m telescope.

     J. Y. Hu, L. F. Wang, and X. J. Jiang, Beijing Astronomical
Observatory, report:  "Further observations and analyses of the
spectroscopic data of SN 1993J obtained at the Beijing Astronomical
Observatory's 2.16-m telescope show that the profile of H-beta
emission line is also double-peaked, in a way similar to that
reported on IAUC 5779 for H-alpha. The local minimum is at about the
rest wavelength in our low-resolution spectra (0.53 nm/pixel).  The
two peaks are shifted by +/- 3600 km/s for both the H-alpha and H-
beta profiles.  These features imply an asymmetric geometry (cf.
IAUC 5777, 5780).  Preliminary modelling shows that axially-symmetric
structures such as a torus can fit the line profiles.  Two
unidentified emission features at 695.0 and 704.0 nm appeared on Apr.
22 and are getting more prominent in the spectra taken afterwards.
It is not clear if these are 'satellite' features of the H-alpha
     Further photoelectric photometry (cf. IAUC 5750, 5755, 5758)
by D. Hanzl, N. Copernicus Planetarium, Brno (H); by M. Kato, Ouda
Station, Kyoto University, Nara (MK); by V. Karlovsky, Hlohovec,
Slovak Republic (VK; comparison star 24 UMa); and by P. Prugniel,
Observatoire de Haute Provence (P):  Apr. 20.91 UT, V = 10.89 +/-
0.02, B-V = +0.68 +/- 0.03 (VK); 25.62, V = 11.27 (MK); 25.64, Ic =
10.60 (MK); 25.89, V = 11.34 +/- 0.07, B-V = +1.08 +/- 0.07 (H);
26.92, V = 11.39 +/- 0.03, B-V = +1.13 +/- 0.05 (H); 29.00, Vc =
11.62, Bc-Vc = +1.25, Vc-Rc = +0.56, Vc-Ic = +0.79 (P); May 1.07,
Vc = 11.74, Bc-Vc = +1.27, Vc-Rc = +0.59, Vc-Ic = +0.84 (P); 3.00,
Vc = 11.86, Bc-Vc = +1.30, Vc-Rc = +0.60, Vc-Ic = +0.88 (P); 4.00,
Vc = 11.90, Bc-Vc = +1.29, Vc-Rc = +0.60, Vc-Ic = +0.88 (P).

1993 May 4                     (5783)            Daniel W. E. Green

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