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IAUC 4531: 1988a

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                                                  Circular No. 4531
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


COMET LILLER (1988a)
     Further positions have been reported as follows:

     1988 UT             R.A. (1950) Decl.          Observer
     Jan. 13.53264    23 51 03.47    -26 37 45.5    Lowe
          14.06563    23 51 09.8     -26 16 06      Liller
          14.11250    23 51 10.4     -26 14 10        "
          14.39971    23 51 12.14    -26 02 43.3    Miyasaka
          14.41880    23 51 13.49    -26 01 56.3      "
          14.45591    23 51 13.57    -26 00 20.9    Gilmore
          14.46355    23 51 13.62    -26 00 03.0      "
          14.53056    23 51 14.43    -25 57 21.9    Jekabsons
          15.07431    23 51 22.2     -25 35 42      Liller
          15.50470    23 51 26.59    -25 17 48.1    McNaught
          15.50729    23 51 26.60    -25 17 42.5      "
          16.11424    23 51 35.4     -24 52 57      Liller

G. Lowe and P. Jekabsons (Perth).  Measurer M. P. Candy.
W. Liller (Vina del Mar, Chile).  Semiaccurate positions.
S. Miyasaka (Kiyosato).  0.16-m f/3.3 hyperboloid astrocamera.
A. C. Gilmore (Mount John Observatory).  Measurer P. M. Kilmartin.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt.

     The following parabolic orbital elements, from 11 observations
Jan. 12-15, are a substantial improvement over those on IAUC 4528:

           T = 1988 Mar. 31.61 ET    W =  56.26
                                     O =  30.31   1950.0
           q =   0.8620 AU           i =  73.75

     1988 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan. 10    23 50.62    -29 00.3    1.885    1.644    10.0
          15    23 51.34    -25 38.4
          20    23 52.66    -22 14.5    1.882    1.514     9.7
          25    23 54.48    -18 48.8
          30    23 56.74    -15 21.2    1.876    1.385     9.3
     Feb.  4    23 59.35    -11 51.5
           9     0 02.28    - 8 19.2    1.864    1.260     8.9
          14     0 05.48    - 4 43.9
          19     0 08.92    - 1 04.9    1.843    1.143     8.4
          24     0 12.58    + 2 38.3
          29     0 16.44    + 6 26.5    1.808    1.037     7.9


1988 January 17                (4531)              Brian G. Marsden

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