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IAUC 6754: C/1997 T1; C/1997 T2; 1997 T3

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                                                  Circular No. 6754
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)


COMET C/1997 T1 (UTSUNOMIYA)
     Total visual magnitude estimates: Oct. 6.75 UT, 10.5 (M. Plsek,
Lelekovice, Czech Republic, 0.35-m reflector; 10' tail in p.a.
110 deg); 6.76, 10.3 (V. Znojil, Brno, Czech Republic, 25 x 100
binoculars; 3' tail in p.a. 140 deg); 7.02, 10.0 (J. E. Bortle,
Stormville, NY, 0.41-m reflector); 7.83, 9.8 (M. Reszelski, Szamotuly,
Poland, 20 x 60 binoculars).


COMET C/1997 T2 (SOHO)
     C. St. Cyr, Naval Research Laboratory, on behalf of the SOHO-LASCO
Consortium (cf. IAUC 6685), reports that D. Lewis, University of
Birmingham, has discovered a comet in both C3 and C2 coronagraphic data.
The peak brightness was perhaps mag about 6, and there was evidence of
a small tail.  Measurements by Lewis, D. Biesecker and St. Cyr
have been reduced by G. V. Williams and are published in detail on MPEC
1997-T05, together with a Kreutz-type orbital solution by the undersigned.

                 1997 UT           R.A. (2000) Decl.
                 Oct.  3.287      12 12.8      - 5 20


COMET 1997 T3
     Uri Carsenty and Andreas Nathues, DLR Institute of Planetary
Exploration, Berlin, report their discovery of a cometary object in the
course of the Uppsala-DLR Trojan Survey program carried out at the
European Southern Observatory together with C.-I. Lagerkvist, S. Mottola
and G. Hahn.  The object was detected on an exposure with the 1-m Schmidt
as a point source, although seven unfiltered CCD images obtained on
three consecutive nights with the Bochum 0.6-m reflector clearly show a
tail extending 15" west-southwestward from the point source,
estimated at R about 18.9.  E. Braatz also assisted with the Oct. 7
observations.

     1997 UT             R.A. (2000) Decl.
     Oct.  5.07800    1 15 20.50   + 3 04 03.0
           5.08532    1 15 20.28   + 3 04 01.6
           6.21191    1 14 46.74   + 3 01 10.9
           6.21799    1 14 46.55   + 3 01 10.1
           7.15794    1 14 18.59   + 2 58 47.9
           7.16691    1 14 18.32   + 2 58 46.5
           7.17177    1 14 18.17   + 2 58 45.8

                      (C) Copyright 1997 CBAT
1997 October 7                 (6754)              Brian G. Marsden

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