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IAUC 7127: C/1999 E1; C/1997 BA6

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                                                  Circular No. 7127
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 E1 (LI)
     Further CCD precise positions have been reported as follows:

     1999 UT             R.A. (2000) Decl.        m1    Observer
     Mar. 17.01175    6 25 59.36   + 5 26 47.0   16.3   Jacques
          17.02198    6 25 59.56   + 5 26 55.7   16.0     "
          17.02439    6 25 59.72   + 5 26 55.8   15.6   Griffin
          17.04863    6 26 00.14   + 5 27 12.2   15.6     "
          17.46832    6 26 09.44   + 5 32 07.8   17.2   Garradd
          17.47269    6 26 09.55   + 5 32 11.0   17.1     "

C. Jacques and L. Duczmal (Serra da Piedade).  0.3-m f/3.3 Schmidt-Cassegrain.
I. P. Griffin, R. C. Maddison, R. K. Fox and W. Weimer (Cocoa).  0.3-m
   f/5 reflector.
G. J. Garradd (Loomberah).  0.45-m f/5.4 reflector.

     Parabolic orbital elements from 10 observations Mar. 13-17:

     T = 1999 Mar. 30.763 TT          Peri. = 339.606
                                      Node  = 127.230   2000.0
     q = 4.05520 AU                   Incl. =  47.246

1999 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Mar. 13     6 24.66    + 4 39.3    3.706    4.058  103.7   13.8     15.4
     18     6 26.36    + 5 38.3    3.773    4.057   99.4   14.0     15.5
     23     6 28.43    + 6 35.2    3.842    4.056   95.2   14.2     15.5
     28     6 30.88    + 7 29.8    3.913    4.055   91.0   14.2     15.5
Apr.  2     6 33.66    + 8 22.1    3.985    4.055   86.9   14.2     15.6
      7     6 36.78    + 9 12.0    4.057    4.056   82.8   14.2     15.6
     12     6 40.20    + 9 59.5    4.130    4.057   78.8   14.0     15.7


COMET C/1997 BA6 (SPACEWATCH)
     Total visual magnitude estimates: 1998 Nov. 17.50 UT, 14.1 (A. Hale,
Cloudcroft, NM, 0.41-m reflector); 22.49, 14.0 (Hale); Dec. 17.45, 13.7
(Hale); 27.81, 14.0 (A. Pearce, Nedlands, Western Australia, 0.41-m
reflector); 1999 Jan. 11.77, 13.8 (Pearce); 20.80, 13.9 (Pearce);
Feb. 21.73, 13.7 (Pearce); 23.73, 13.7 (Pearce); Mar. 14.54, 13.3
(M. Mattiazzo, Wallaroo, South Australia, 0.20-m reflector).

                      (C) Copyright 1999 CBAT
1999 March 17                  (7127)              Brian G. Marsden

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