Central Bureau for Astronomical Telegrams

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IAUC 5533: 1992Z; NGC 5548; N Cyg 1992; 1992H

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IAUC number

                                                  Circular No. 5533
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

     M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
University of Chile, report the discovery by R. Antezana of a
supernova located about 3" east and 4" north of the nucleus of an
anonymous galaxy at R.A. = 13h26m09s.0, Decl. = -29 45'17", equinox
1950.0).  The supernova, of mpg about 19, was found on a 20-min
unfiltered IIa-O plate taken by Hamuy with the CTIO Curtis Schmidt
telescope on May 29.233 UT.  Confirmation was made by R. Schommer
(CTIO) from B and V images obtained in nonphotometric conditions on
June 1.146 with the CTIO 0.9-m telescope.

NGC 5548
     J. Penfold, Mount Royal College and University of Calgary,
writes:  ''I confirm the radical change in the appearance of the H-
beta line in NGC 5548 (cf. IAUC 5521).  A spectrum obtained on May
5 with the 1.83-m telescope at the Dominion Astrophysical Observatory
(1.2-nm resolution) shows that the continuum flux has decreased
by a factor of 1.85 and the H-beta flux has decreased by a
factor of 4.1 when compared with observations in early 1989 February.
The continuum is now apparently fainter than at any time during
the International Campaign of 1989 (Peterson et al. 1991, Ap.J.
368, 119).  Based on the appearance of the H-beta line, NGC 5548
has changed from Seyfert type 1.5 to 1.9,  showing a narrow H-beta
profile superimposed upon a very faint, broad base.  A low S/N
spectrum taken on 1992 Mar. 31 also shows an apparent lack of any
broad H-beta component.  Monitoring observations are continuing on
a monthly basis at DAO."

     Visual magnitude estimates (cf. IAUC 5526):  May 24.95 UT, 8.4
(B. H. Granslo, Fjellhamar, Norway); 25.94, 8.4 (E. Schweitzer,
Strasbourg, France); 27.84, 8.4 (M. Tombelli, Montelupo, Italy);
29.96, 8.3 (Granslo); 31.96, 8.4 (Granslo).

     Visual magnitude estimates by W. Wren, McDonald Observatory
(cf. IAUC 5502): Apr. 28.24 UT, 15.9; May 18.14, 16.1.

1992 June 1                    (5533)            Daniel W. E. Green

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