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IAUC 6994: 1998dn; 1998dl; 52P

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                                                 Circular No. 6994
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)

     L. Cao, on behalf of the Beijing Astronomical Observatory
(BAO) Supernova Survey, reports the discovery of a supernova (mag
15.8) found on an unfiltered CCD frame taken on Aug. 19.76 UT.  SN
1998dn is located at R.A. = 1h01m27s.08, Decl. = -7o36'36".7
(equinox 2000.0), which is 102" west and 79" south of the center of
NGC 337A.  A similar observation on Aug. 22.79 confirmed the
supernova's existence at almost the same magnitude.  The Digital
Sky Survey image and a CCD image taken on 1998 Jan. 15 of the same
field show no sign of the new star.
     L. Cao and J.-Y. Wei, BAO; and W.-D. Li, University of
California at Berkeley, report that a CCD spectrogram (range 380-
635 nm) of SN 1988dn was obtained by H.-M. Shi (Shanghai
Astronomical Observatory) with the BAO 2.16-m telescope on Aug.
23.72 UT.  The spectrum shows a red continuum, along with H-beta
and He I 587.6-nm/Na D line features, indicating this to be a
type-II supernova well after maximum.

SUPERNOVA 1998dl IN NGC 1084
     A. V. Filippenko, University of California at Berkeley,
reports that inspection of a CCD spectrum of SN 1998dl (cf. IAUC
6992) obtained on Aug. 23 by C. De Breuck (Lawrence Livermore
National Laboratory) with the 3-m Shane reflector at Lick
Observatory reveals that the object is a normal type-II supernova,
with well-developed P-Cyg hydrogen Balmer profiles.  Na D and the
Ca II near-infrared triplet are strong, and there are several
prominent Fe II lines.

     This comet continues to be unusually bright (cf. IAUC 6975),
as indicated by the following total visual magnitude estimates:
July 26.02 UT, 11.2 (M. Reszelski, Szamotuly, Poland, 0.25-m
reflector); 30.05, 11.6 (K. Sarneczky, Agasvar, Hungary, 0.44-m
reflector); Aug. 5.13, 12.3 (J. M. Trigo, Benicassim, Castellon,
Spain, 0.17-m reflector); 15.97, 12.8 (M. Lehky, Hradec Kralove,
Czech Republic, 0.42-m reflector); 20.00, 12.3 (M. Plsek,
Lelekovice, Czech Republic, 0.20-m reflector); 23.13, 11.8 (J.
Carvajal, Avila, Spain, 0.32-m reflector).

                      (C) Copyright 1998 CBAT
1998 August 24                 (6994)            Daniel W. E. Green

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