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IAUC 5625: 1992az; 1992ba

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                                                  Circular No. 5625
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SUPERNOVA 1992az IN NGC 818
     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of a supernova (mag about 18) in the spiral galaxy NGC 818 =
UGC 1633.  The new object is located at R.A. = 2h05m45s.04, Decl. =
+38 32'10".0 (equinox 1950.0), which is 28".5 east and 16".2 south
of the galaxy's center (end figures 42s.61, 26".2).  The supernova
was found on a Tech Pan film obtained by Pollas (assisted by J.-B.
Emond) on Sept. 27.04 UT and confirmed on an R plate taken Sept.
28.08 (respective limiting magnitudes 21.5 and 19).  Nothing is
visible on the POSS prints to R about 19 and B about 20.  A nearby
star of mag about 15 has end figures 45s.58, 38".1.
     F. Michel and P. Prugniel obtained a CCD image on Sept. 29.06
UT with the 1.2-m Observatoire de Haute-Provence telescope, under
non-photometric conditions, measuring V = 18.85 +/- 0.2.
     R. Kirshner and S. Gordon, Harvard-Smithsonian Center for
Astrophysics, communicate:  "Spectra obtained with the Multiple
Mirror Telescope (+ Red Channel spectrograph, range 400-800 nm) show
that this object is a type-II supernova, with a well-developed P-
Cyg profile at H-alpha.   It closely resembles other type-II
supernovae at an age of about 1 month.  This is a reasonable candidate
for a distance determination by the Expanding Photosphere Method,
and further observations (especially V, R, and I photometry) will
be valuable."


SUPERNOVA 1992ba IN NGC 2082
     R. Evans, Hazelbrook, New South Wales, reports his visual
discovery on Sept. 30.75 UT of a supernova of mag about 14.0, located
about 1' west of the center of NGC 2082 (R.A. = 5h41m.6, Decl. =
-64 20', equinox 1950.0)
     M. M. Phillips, Cerro Tololo Interamerican Observatory,
reports: "A spectrum obtained of Evans' supernova in NGC 2082 shows
that this object is a type-II event.  The spectrum, which was
acquired with the CTIO 4.0-m telescope on Oct. 1.36 UT, displays
strong, broad, P-Cyg emission lines of hydrogen atop a blue continuum.
The absorption component is noticeably weak at H-alpha, but
quite well developed at H-beta and H-gamma.  Weaker P-Cyg lines of
He I (587.6 and 447.1 nm) are clearly visible as well.  Synthetic
photometry of a wide-slit (10") spectrum yields V = 15.22 and B-V =
+0.07.  From these observed properties, it appears very likely that
this supernova has been caught at an early epoch."


1992 October 1                 (5625)            Daniel W. E. Green

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