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IAUC 6717: 1997 P2; 1997dc; 2P

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                                                  Circular No. 6717
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)


COMET 1997 P2
     T. Gehrels, Lunar and Planetary Laboratory, reports the automatic
discovery of a comet by Spacewatch.  Available CCD observations:

     1997 UT             R.A. (2000) Decl.        m1    Observer
     Aug. 12.24372   21 40 04.76   - 6 37 47.8   18.6   Gehrels
          12.26467   21 40 04.28   - 6 37 45.0   19.0     "
          12.28579   21 40 03.67   - 6 37 44.7   19.0     "
          13.33624   21 39 36.76   - 6 36 39.3          Balam
          13.35463   21 39 36.28   - 6 36 37.1            "
          13.36181   21 39 36.08   - 6 36 36.8            "

T. Gehrels (Kitt Peak).  0.9-m Spacewatch telescope.  Tail 1' long in
   p.a. 325 deg.
D. D. Balam (Dominion Astrophysical Observatory).  1.8-m Plaskett
   reflector.  Clearly cometary, quite condensed, no tail observed.


SUPERNOVA 1997dc IN NGC 7678
     A. Piemonte, S. Benetti and M. Turatto, European Southern Observatory,
observed SN 1997dc with the 1.54-m Danish telescope (+ DFOSC) on
Aug. 11.2 UT at La Silla: "The spectrum (range 400-950 nm, resolution
1.1 nm) shows He I lines with P-Cyg profiles at 587.6 (possibly
contaminated by Na D), 667.8 and 706.5 nm with an expansion velocity
of 7500 km/s.  Similar expansion velocity is shown by the Si II doublet
635.5 nm, while the expansion velocity measured from the Ca II infrared
triplet is 15 000 km/s.  The strong He I lines and the relatively low
expansion velocity are consistent with a type Ib classification around
maximum light.  The spectrum shows a red continuum indicative of strong
reddening, as suggested by the intense interstellar Na D absorption
lines.  The redshift at the location of the supernova is z = 0.012, as
measured from the Na D absorption and the emission lines of an
underlying H II region."


COMET 2P/ENCKE
     Visual m1 estimates: June 26.46 UT, 7.8 (A. Pearce, City Beach,
W. Australia, 20 x 80 binoculars); 30.46, 8.4 (Pearce);
July 3.35, 8.5 (D. A. J. Seargent, The Entrance, N.S.W., 25 x 100
binoculars); 7.45, 9.7 (Pearce, Subiaco, W. Australia, 0.2-m
reflector).  CCD m2 estimates by G. J. Garradd, Loomberah, N.S.W.
(0.25-m reflector): July 7.40 UT, 16.6; 10.47, 16.1; 14.44, 16.0; 21.37,
16.2; 24.49, 16.9; 28.50, 17.1; 30.47, 17.4.

                      (C) Copyright 1997 CBAT
1997 August 13                 (6717)              Brian G. Marsden

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