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IAUC 6994: 1998dn; 1998dl; 52P

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                                                 Circular No. 6994
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 1998dn IN NGC 337A
     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.


COMET 52P/HARRINGTON-ABELL
     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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