Central Bureau for Astronomical Telegrams

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IAUC 6292: 1996B; V705 Cas; P/1996 A1

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IAUC number

                                                  Circular No. 6292
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)

     A. Dimai, Cortina d'Ampezzo, Italy, reports the discovery by
Alessandro Gabrijelcic (Agordo, Italy) of a possible supernova near an H II
region in NGC 4357, 25" west and 5" south of the galaxy's core.  The object
is of magnitude 17.5-18.0 and has been recorded on three CCD images since
its discovery on Jan. 16.9, most recently on Jan. 19.9.  Comparison by
G. V. Williams, Harvard-Smithsonian Center for Astrophysics (CfA), of the Jan.
19.9 image with the Digital Sky Survey indeed shows a new object on the
former at R.A. = 12h23m56s.6, Decl. = +48d46'42" (equinox 2000), the
position of the galaxy's core having end figures 58s.8, 46".  A. Riess
and R. Kirshner, CfA, also confirm the object on a V-band CCD image
obtained on Jan. 21.49 UT by A. Milone with the 1.2-m reflector at Mt. Hopkins.

     L. Wang, University of Texas at Austin, communicates: "A low-resolution
(0.5 nm) CCD spectrum (range 512-788 nm) obtained on Jan. 22 shows
that this is a type II supernova with broad H-alpha emission and clear
P-Cyg absorption.  The FWHM of the H-alpha emission is 16 000 km/s."

     S. P. S. Eyres, Keele University; R. J. Davis, University of
Manchester, Jodrell Bank; and M. F. Bode and H. M. Lloyd, Liverpool
John Moores University, report the detection and imaging of radio
emission at 6 cm from V705 Cas (Nova Cas 1993) using the MERLIN array
on 1995 July 22.  The source position was measured with respect to the
VLBI point source 2351+550.  Preliminary mapping shows the source to be
extended with a peak intensity in a 50-milliarcsec beam of 370 +/- 65
micro Jy at R.A. = 23h41m47s.235, Decl. = +57d31'00".930 (equinox J2000.0,
uncertainty +/- 0".005).  The integrated flux of the source is
2140 +/- 20 micro Jy.  The angular extent of the partial shell (about
200 milliarcsec) indicates a distance of 2.5 kpc.

     Orbital elements on MPEC 1996-B04 show that this comet (cf. IAUC
6288) is of short period, with e approximately 0.40 and P approximately
18 years.  A CCD observation by H. Mikuz (Ljubljana, Slovenia) on
Jan. 17.89 (0.36-m reflector + V filter) gives V = 16.8.

                      (C) Copyright 1996 CBAT
1996 January 22                (6292)              Brian G. Marsden

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