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IAUC 5555: 1992ag; 1992ad; N Sco 1992; 1992H

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                                                  Circular No. 5555
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

SUPERNOVA 1992ag IN ESO 508-G67
     J. Maza, University of Chile; and M. Hamuy, Cerro Tololo
Interamerican Observatory, report the discovery by M. Wischnjewsky
of a supernova located about 4" west of the nucleus of the spiral
galaxy ESO 508-G67 (IRAS 13214-2337; R.A. = 13h21m26s.0, Decl. =
-23 37'06", equinox 1950.0).  The supernova, of mpg about 16.5, was
found on a 20-min unfiltered IIa-O plate taken by L. Wells with the
CTIO Curtis Schmidt telescope on June 29.127 UT.  Confirmation was
made by K. Wakamatsu (Gifu University) and M. Malkan (University of
California, Los Angeles) from B and V images obtained on July 3.021
with the CTIO 0.9-m telescope.  A spectrogram (range 320-750 nm),
obtained by Hamuy and R. Aviles on July 3.042 with the CTIO 1.5-m
telescope, shows the characteristic Si II (635.5 nm) feature of
type-Ia supernovae.  The minimum of the Si II absorption yields an
expansion velocity of about 11 800 km/s with respect to the galaxy's
rest frame.  This spectrum shows a significant resemblance to
a spectrum of the type-Ia SN 1989B taken 7 days before maximum
light.  The spectrum of the underlying galaxy yields a redshift of
z = 0.025.

     A. V. Filippenko, University of California at Berkeley,
reports that a CCD spectrogram (range 480-750 nm) obtained by J. S.
Miller and H. D. Tran (University of California at Santa Cruz) on
July 2 UT with the Shane 3-m reflector at Lick Observatory shows
that SN 1992ad is of type II.  The strong H-alpha line exhibits a
classic P-Cyg profile.
     Corrigendum.  On IAUC 5552, line 18, for  P. Vernon  read  P.

     Further photometry by A. C. Gilmore, Mt. John University
Observatory (cf. IAUC 5551):  July 1.59 UT, V = 7.62 +/- 0.02, B-V =
+1.01 +/- 0.01, U-B = +0.01 +/- 0.03, V-R = +0.76 +/- 0.01; V-I =
+1.50 +/- 0.02.

     Visual magnitude estimate by W. Wren, McDonald Observatory
(cf. IAUC 5533):  June 16.14 UT, 16.8.

1992 July 4                    (5555)            Daniel W. E. Green

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