Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

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

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6816 SEARCH Read IAUC 6818

View IAUC 6817 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 6817
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 1998E IN NGC 5161
     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.


COMET C/1997 J2 (MEUNIER-DUPOUY)
     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).


COMET 69P/TAYLOR
     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

Read IAUC 6816 SEARCH Read IAUC 6818

View IAUC 6817 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!