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IAUC 7285: C/1999 S3; C/1999 S4

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                                                  Circular No. 7285
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 S3 (LINEAR)
     Ephemeris extension to IAUC 7265 (elements MPEC 1999-T25):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct.  9     0 03.75   +55 49.4   1.137   1.930  129.1   23.7   12.1
     14    23 30.50   +57 36.2   1.152   1.919  126.4   24.7   12.1
     19    22 56.95   +58 33.9   1.177   1.911  122.9   26.0   12.2
     24    22 25.42   +58 48.3   1.211   1.904  119.0   27.2   12.2
     29    21 57.58   +58 29.6   1.252   1.899  115.0   28.3   12.3
Nov.  3    21 34.22   +57 49.3   1.299   1.896  110.9   29.3   12.3
      8    21 15.34   +56 57.8   1.351   1.894  107.0   30.0   12.4
     13    21 00.50   +56 03.0   1.405   1.895  103.3   30.6   12.5
     18    20 49.10   +55 10.6   1.461   1.897   99.7   30.9   12.6
     23    20 40.55   +54 24.0   1.518   1.902   96.5   31.1   12.7
     28    20 34.30   +53 45.3   1.574   1.908   93.5   31.1   12.8

     Visual m_1 estimates:  Oct. 8.80 UT, 12.7 (K. Sarneczky,
Raktanya, Hungary, 0.39-m reflector); 13.09, 12.4 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 16.83, 11.6 (K.
Hornoch, Lelekovice, Czech Republic, 0.35-m reflector).


COMET C/1999 S4 (LINEAR)
     Ephemeris extension to IAUC 7267, from improved parabolic
orbital elements on MPEC 1999-U14:

     T = 2000 July 26.4630 TT         Peri. = 150.9862
                                      Node  =  83.1500  2000.0
     q = 0.766618 AU                  Incl. = 149.3454

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 19     4 45.67   +35 56.0   3.393   4.096  129.2   10.9   15.8
     29     4 31.67   +36 35.1   3.167   3.987  140.9    9.0   15.5
Nov.  8     4 13.86   +37 01.4   2.972   3.877  152.4    6.8   15.3
     18     3 52.66   +37 06.9   2.816   3.766  161.4    4.8   15.0
     28     3 29.16   +36 44.9   2.703   3.653  161.7    4.9   14.8
Dec.  8     3 05.02   +35 52.9   2.637   3.539  152.4    7.4   14.6
     18     2 42.11   +34 35.2   2.614   3.424  139.7   10.7   14.4
     28     2 21.93   +33 01.3   2.630   3.308  126.2   13.9   14.3

                      (C) Copyright 1999 CBAT
1999 October 19                (7285)            Daniel W. E. Green

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