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IAUC 6715: 1997dc; C/1996 M2; C/1997 D1; C/1997 J1

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                                                  Circular No. 6715
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1997dc IN NGC 7678
     The Beijing Astronomical Observatory (BAO) supernova survey
(cf. IAUC 6612, with also A. Esamdin, Urmqi Astronomical Station)
reports an apparent supernova in NGC 7678, discovered on unfiltered CCD
frames taken with the 0.6-m reflector at BAO on Aug. 5, 8 and 9.  The
supernova brightened from unfiltered mag 18.3 +/- 0.3 on Aug. 5 to
17.5 +/- 0.3 on Aug. 8.  The supernova's position is
R.A. = 23h28m28s.41, Decl. = +22d25'23".0 (equinox 2000.0), which is
offset 8".7 east and 5".0 north of the nucleus of the galaxy.
Unfiltered CCD images of the same field was taken on 1996 Nov. 26 (limiting
mag about 19.0), when no star showed at the position of the supernova.


COMET C/1996 M2 (SOHO)
     C. St. Cyr, Naval Research Laboratory, reports, for the SOHO-LASCO
Consortium (see IAUC 6685), the discovery by B. McCarty, University of
Birmingham, of another comet in a visual examination of archival
SOHO-LASCO C3 coronagraph data.  No tail was evident, and the comet
was not detected by C2.  Measurements by D. A. Biesecker and St. Cyr
have been reduced by G. V. Williams and are given on MPEC 1997-P06
in detail, the approximate discovery position being:

                   1996 UT           R.A. (2000) Decl.
                   June 25.730       6 10.8      +19 43

Comet C/1996 M2 is evidently another Kreutz sungrazer.  Orbital
computations by the undersigned, also given on MPEC 1997-P06,
show a strong resemblance to the corresponding computation for
comet C/1996 M1, observed eight days previously (IAUC 6713, MPEC 1997-P05),
indicating the close physical relationship of this pair.


COMET C/1997 D1 (MUELLER)
     Total visual magnitude estimates: Apr. 7.90 UT, 13.3 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); May 9.92, 13.3 (M. Meyer,
Frauenstein, Germany, 0.25-m reflector); 25.89, 13.0 (K. Hornoch,
Lelekovice, Czech Republic, 0.35-m reflector).


COMET C/1997 J1 (MUELLER)
     Total visual magnitudes: July 11.93 UT, 13.8 (M. Lehky,
Hradec Kralove, Czech Republic, 0.42-m reflector); Aug. 5.98, 13.7
(Bouma); 7.04, 13.6: (G. Comello, Roden, The Netherlands, 0.30-m reflector).

                      (C) Copyright 1997 CBAT
1997 August 9                  (6715)              Brian G. Marsden

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