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IAUC 6441: 1996am; V1974 Cyg; 57P

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                                                  Circular No. 6441
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6418) reports the discovery of a supernova on CCD images taken
by S. Chan on the Mount Stromlo 1.27-m telescope (+ Macho Camera).
SN 1996am is located at R.A. = 21h46m07s.48, Decl. = -44o00'12".7
(equinox 2000.0), which is near the nucleus of the host galaxy
(itself situated near Abell 3809).  A nearby star of mag 12 is at
R.A. = 21h46m12s.57, Decl. = -43o58'51".3.  SN 1996am is visible on
CCD images taken on July 12 at V approximately R approximately 19.0,
and it was not detected on similar frames taken on July 3.  A
spectrum (range 350-1000 nm) obtained on July 25 with the MSSSO
2.3-m Imager + Grism shows that this is a type-Ia supernova near
maximum.  The host galaxy's redshift, measured from H-alpha
emission at the position of the supernova, is z = 0.065, which is
coincident with the redshift of Abell 3809 (z = 0.062).

     S. Balman, J. S. Gallagher and M. Orio, University of
Wisconsin at Madison, report:  "Using the Kitt Peak 3.5-m WIYN
telescope (+ CCD imager) on May 27 UT, we detected an H-alpha
nebulosity associated with the classical nova V1974 Cyg (N Cyg
1992).  The faint, diffuse, H-alpha emission around the nova had
dimensions in each direction as follows: north, 125"; south, 190";
west, 140"; east, 142".  An elliptical cavity was also prominent
around the nova, extending as follows:  north, 100"; south, 21";
west, 35"; east, 38".  The H-alpha nebulosity was found to peak in
the southwest from a region 152" x 208" with long, thin, chevron-
like filamentary structures.  The size of the nebulosity is
consistent with light travel time arguments for a reflection nebula.
Our observation confirms the previous spectroscopic result of
extensive H-alpha emission from the vicinity of the nova by Rosino
et al. (1996, AAp, submitted).  On June 16, the nebulosity showed
no substantial changes; the narrowband H-alpha luminosity of the
nebula in the June observation is 2-3 times that of the nova, which
also showed a shell diameter of 0".8 with an extension to the

     This comet is in outburst; m1 estimates:  July 24.78 UT, 13.3
(A. Nakamura, Kuma, Japan, 0.60-m reflector + CCD); 26.08, 13.3 (H.
Mikuz, Ljubljana, Slovenia, 0.20-m reflector + CCD + V filter);
26.45, 11.8: (A. Hale, Cloudcroft, NM, 0.41-m reflector, visual);
28.04, 11.9: (M. Plsek, Lelekovice, Czech Republic, 0.35-m
reflector, visual).

                      (C) Copyright 1996 CBAT
1996 July 29                   (6441)            Daniel W. E. Green

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