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IAUC 6712: C/1997 O1; C/1995 O1

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                                                 Circular No. 6712
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 C/1997 O1 (TILBROOK)
     Ephemeris extension to IAUC 6707 (elements on MPEC 1997-P03):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug.  5    12 45.71   - 8 59.2   1.582   1.413   61.4   39.1   10.0
     10    12 53.87   - 6 17.3   1.696   1.432   57.4   36.6   10.2
     15    13 01.40   - 3 58.2   1.809   1.454   53.5   34.0   10.4
     20    13 08.45   - 1 57.3   1.918   1.480   49.6   31.4   10.6
     25    13 15.13   - 0 11.2   2.024   1.508   46.0   28.8   10.8
     30    13 21.54   + 1 23.0   2.125   1.539   42.4   26.3   11.0
Sept. 4    13 27.74   + 2 47.6   2.221   1.572   39.1   23.8   11.2
      9    13 33.79   + 4 04.6   2.312   1.608   35.9   21.5   11.4
     14    13 39.73   + 5 15.6   2.396   1.645   32.9   19.4   11.6
     19    13 45.57   + 6 21.8   2.475   1.685   30.2   17.5   11.7

     Visual m_1 estimates:  July 25.35 UT, 9.4 (D. A. J. Seargent,
The Entrance, N.S.W., 25x100 binoculars); 26.42, 10.3 (J. Tilbrook,
Clare, S. Australia, 0.20-m reflector); 27.47, 10.3 (A. Pearce,
Subiaco, W. Australia, 0.2-m reflector); 29.40, 9.5 (Seargent; coma
diameter 5'); 31.36, 9.9 (Seargent); Aug. 1.39, 10.0 (Seargent).


COMET C/1995 O1 (HALE-BOPP)
     Ephemeris extension to IAUC 6671 (elements on MPC 29568):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 20     7 39.50   -20 12.9   2.961   2.389   47.1   18.1    4.1
     30     7 48.41   -24 10.8   2.999   2.512   52.3   18.5    4.4
Sept. 9     7 56.16   -28 15.0   3.034   2.633   57.5   18.8    4.6
     19     8 02.54   -32 24.7   3.066   2.753   62.6   18.9    4.8
     29     8 07.28   -36 38.2   3.099   2.872   67.6   18.8    5.0
Oct.  9     8 10.01   -40 52.9   3.135   2.989   72.4   18.6    5.2
     19     8 10.28   -45 04.8   3.177   3.105   76.8   18.2    5.4
     29     8 07.56   -49 09.2   3.225   3.220   80.8   17.7    5.6
Nov.  8     8 01.18   -52 59.9   3.281   3.333   84.4   17.2    5.8
     18     7 50.50   -56 29.3   3.348   3.445   87.3   16.7    6.0
     28     7 35.07   -59 29.5   3.424   3.556   89.6   16.1    6.2
Dec.  8     7 14.89   -61 51.9   3.511   3.666   91.2   15.6    6.4
     18     6 50.92   -63 29.5   3.609   3.775   92.1   15.1    6.6
     28     6 25.11   -64 19.3   3.716   3.883   92.4   14.7    6.7

                      (C) Copyright 1997 CBAT
1997 August 7                  (6712)            Daniel W. E. Green

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