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

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


SUPERNOVA 1998fb IN ANONYMOUS GALAXY
     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
http://msowww.anu.edu.au/~reiss/Abell_SNSearch/.


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.


SUPERNOVA 1998es IN NGC 632
     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).


COMET C/1998 M5 (LINEAR)
     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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