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IAUC 7077: 1998fb; 1998fa in UGC 3513; 1998es; C/1998 M5

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IAUC number

                                                 Circular No. 7077
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     D. Reiss reports the discovery by the Mount Stromlo Abell
Cluster Supernova Search Team (cf. IAUC 6639) of an apparent
supernova (V = 18.4) on V and R CCD images taken on Dec. 20
(limiting mag V = 19.5) by R. Hola at the Mount Stromlo 1.27-m
telescope (+ Macho Camera).  SN 1998fb is located near Abell 3128
at R.A. = 3h30m45s.86, Decl. = -52o32'12".2 (equinox 2000.0), which
is 0".3 east and 0".1 north of the host galaxy's center.  A nearby
star has position end figures 50s.46, 31'31".2.  SN 1998fb was not
visible on similar images taken on Nov. 29 (limiting mag V = 20),
but it was confirmed by Hola with the same telescope on Dec. 23
(limiting mag V = 19.1).  Finding charts are available at

SUPERNOVA 1998fa in UGC 3513
     S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1998fa was taken by P. Berlind on Dec. 27.2 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph), showing
it to be a type-II supernova near maximum light.  The spectrum
exhibits a blue continuum with a broad P-Cyg H-alpha profile and a
strong H-beta absorption.  The recession velocity of the host
galaxy is 7450 km/s, measured via narrow H-alpha emission, and the
supernova photospheric expansion velocity is 13 300 km/s, measured
with the broad H-alpha trough.

     Magnitude estimates (cf. IAUC 7070):  Dec. 12.510 UT, 14.6 (K.
Kadota and S. Yoshida, Ageo City, Saitama, Japan; unfiltered CCD);
20.822, 14.2 (M. Reszelski, Szamotuly, Poland; visual).

     Total visual magnitude estimates:  Nov. 24.72 UT, 10.0 (M.
Lehky, Hradec Kralove, Czech Republic, 25x100 binoculars); Dec.
6.80, 10.0 (A. Pereira, Cabo da Roca, Portugal, 0.25-m reflector);
11.99, 9.8 (J. Bortle, Stormville, NY, 0.41-m reflector); 15.71,
9.7 (W. Hasubick, Buchloe, Germany, 25x100 binoculars); 20.75, 9.7
(M. Reszelski, Szamotuly, Poland, 20x60 binoculars); 28.71, 9.8
(Lehky; moonlight).

                      (C) Copyright 1998 CBAT
1998 December 28               (7077)            Daniel W. E. Green

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