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IAUC 7072: C/1998 Y1

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                                                  Circular No. 7072
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/1998 Y1 (LINEAR)
     LINEAR has discovered another comet.  CCD astrometry:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     Dec. 22.30945    7 03 18.04   +20 18 49.8   18.5   Blythe
          22.37792    7 03 16.45   +20 21 13.1   18.6     "
          23.92879    7 02 47.06   +21 16 02.1   16.7   Lehmann
          23.93406    7 02 46.90   +21 16 13.6   16.5   Sarounova
          23.93640    7 02 46.89   +21 16 18.2            "
          23.99209    7 02 45.60   +21 18 17.1   17.0   Moravec
          24.00179    7 02 45.35   +21 18 37.4            "
          24.22660    7 02 41.22   +21 26 36.7   16.0   Offutt
          24.23815    7 02 40.94   +21 27 00.7   16.4     "
          24.33438    7 02 38.66   +21 30 25.7          Rogers
          24.34913    7 02 38.37   +21 30 56.4            "

M. Blythe, F. Shelly and M. Bezpalko (Socorro).  Measurers J. Stuart,
   H. Viggh and R. Sayer.  1.0-m f/2.15 reflector.
G. Lehmann and J. Kandler (Schonbrunn).  0.50-m f/4.0 reflector.
L. Sarounova (Ondrejov).  0.65-m f/3.6 reflector.  Coma about 25" in
   diameter, short and probably wide tail to northwest.  m2 = 17.8.
Z. Moravec (Klet).  0.57-m f/5.2 reflector.  Coma of diameter about 10".
W. Offutt (Cloudcroft).  0.60-m f/7 Ritchey-Chretien.  Central condensation
   about 6"; coma extending 8" north, 7" east, 6" south and 11" west.
J. E. Rogers (Camarillo).  0.25-m Schmidt-Cassegrain.

     The following parabolic orbital elements, by the undersigned, are
from the selected data above.  The comet is likely of short period.

     T = 1998 Nov. 20.962 TT          Peri. = 339.790
                                      Node  =  98.987   2000.0
     q = 1.78642 AU                   Incl. =  29.492

1998/99     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Dec. 23     7 03.08    +20 43.2    0.863    1.833  166.1    7.4     16.3
     28     7 01.29    +23 39.4    0.870    1.849  172.0    4.3     16.4
Jan.  2     6 59.21    +26 31.3    0.884    1.866  175.7    2.3     16.4
      7     6 57.03    +29 14.7    0.906    1.885  172.6    3.9     16.5
     12     6 54.95    +31 46.1    0.935    1.907  167.0    6.7     16.7
     17     6 53.19    +34 03.2    0.972    1.929  161.2    9.5     16.8
     22     6 51.94    +36 04.7    1.015    1.954  155.6   12.0     16.9

                      (C) Copyright 1998 CBAT
1998 December 24               (7072)              Brian G. Marsden

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