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IAUC 6817: 1998E; C/1997 J2; 69P

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                                                 Circular No. 6817
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)

     Simon Woodings, Ralph Martin, and Andrew Williams report their
discovery of an apparent supernova (R about 16.5) on Jan. 29.7 UT
with the Perth-Lowell 0.61-m reflector in the course the Perth
Astronomy Research Group's automated supernova search at Perth
Observatory.  SN 1998E is located 3" east and 8" south of the
center of NGC 5161 (galaxy center at R.A. = 13h29m14s.1, Decl. =
-33o10'30", equinox 2000.0).  The last previous image of the field
was taken on Jan. 9, with no object visible at this position to mag
about 19.
     N. Suntzeff, Cerro Tololo Interamerican Observatory (CTIO),
reports that M.-T. Ruiz, University of Chile, obtained
spectrophotometry (range 370-700 nm; resolution 1200) of SN 1998E
with the CTIO 4-m Blanco telescope on Jan. 31.35 UT.  The reduced
spectrophotometry shows a strong blue continuum with prominent
emission lines, consistent with a type-IIn supernova classification.
The most prominent emission lines are H-alpha, H-beta, H-gamma, and
H-delta, which have sharp cores (< 300 km/s) superimposed on broad
wings that extend out to 5000 km/s from the rest wavelength.  The
line cores are slightly blueshifted with respect to the H I
velocity of the galaxy by about 50 km/s.  Weaker emission lines of
[Fe II] from multiplets 42, 46, 48, 49, and 74 are also present in
the region 500-650 nm.  There is no evidence for He I at 587.6 nm,
which is commonly seen in early-stage type-IIn supernovae.  The
only absorption lines present are from Ca II H+K.

     Visual m_1 estimates:  Jan. 1.71 UT, 10.6 (M. Lehky, Hradec
Kralove, Czech Rep., 25x100 binoculars); 17.72, 11.1 (V. Znojil,
Brno, Czech Rep., 25x100 binoculars); 23.74, 10.4 (M. Reszelski,
Szamotuly, Poland, 0.25-m reflector); 29.73, 10.9 (M. Plsek,
Lelekovice, Czech Rep., 0.35-m reflector).

     Visual m_1 estimates:  Jan. 17.77 UT, 11.9 (K. Hornoch,
Lelekovice, Czech Republic, 0.35-m reflector); 22.05, 12.4 (A.
Pereira, Cabo da Roca, Portugal, 0.25-m reflector); 25.83, 12.3 (R.
J. Bouma, Groningen, The Netherlands, 0.25-m reflector); 28.64,
12.3 (A. Pearce, Nedlands, W. Australia, 0.41-m reflector); 29.83,
12.3 (Hornoch).

                      (C) Copyright 1998 CBAT
1998 January 31                (6817)            Daniel W. E. Green

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