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IAUC 6745: SUNGRAZING COMETS; 1997df; C/1997 J2

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                                                 Circular No. 6745
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

    C. St. Cyr, Naval Research Laboratory, on behalf of the SOHO-
LASCO Consortium (cf. IAUC 6685), reports the discovery of three
more probable Kreutz sungrazing comets.  Measurements by St. Cyr
and D. Biesecker have been reduced by G. V. Williams and are given
on MPEC 1997-S05, 1997-S06, and 1997-S07, together with tentative
orbital elements by B. G. Marsden.  C/1997 R1, discovered by
Biesecker, appeared in C3 coronagraphic data only and brightened to
at best m_1 about 8.  C/1997 R2, also discovered by Biesecker,
appeared in both C3 and C2 data and brightened to m_1 about 6.5.
C/1997 R3, discovered by S. Stezelberger, was also in both C3 and
C2 data and peaked at m_1 about 6.  None of the comets showed any
evidence of a tail.

     1997 UT           R.A. (2000) Decl.       Comet
     Sept. 8.149      10 47.4      + 4 43     C/1997 R1
          14.841      11 09.1      + 2 04     C/1997 R2
          15.998      11 10.1      + 1 36     C/1997 R3

     The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6639) reports the discovery of an apparent supernova (R = 19)
on V and R CCD images taken on Aug. 15 by S. Chan at the Mount
Stromlo 1.27-m telescope (+ Macho Camera).  SN 1997df is located
near Abell 3223 at R.A. = 4h09m13s.8, Decl. = -30o42'23".3 (equinox
2000.0), which is 5".5 west and 2".9 north of the host galaxy.  A
nearby star has position end figures 16s.17, 41'17".6.  SN 1997df
was not visible on similar images taken on Aug. 3 (limiting mag R =
21), but is present in V and R images taken on Aug. 27, Sept. 8,
Sept. 10, and Sept. 17.

     Total visual magnitude estimates:  Aug. 9.24 UT, 12.2 (C. E.
Spratt, Victoria, BC, 0.20-m reflector); 25.81, 11.4 (V. S. Nevski,
Vitebsk, Belarus, 0.30-m reflector); 30.91, 11.7 (J. Carvajal,
Soria, Spain, 0.32-m reflector); Sept. 5.81, 12.0 (K. Sarneczky,
Raktanya, Hungary, 0.30-m reflector); 11.09, 11.8 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 16.79, 11.7 (M.
Plsek, Lelekovice, Czech Republic, 0.20-m reflector); 22.04, 12.0
(J. Bortle, Stormville, NY, 0.41-m reflector).

                      (C) Copyright 1997 CBAT
1997 September 22              (6745)            Daniel W. E. Green

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