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IAUC 4528: 1988a

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                                                  Circular No. 4528
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)
     The following positions have been reported:

     1988 UT             R.A. (1950) Decl.          Observer
     Jan. 11.06458    23 50 41.7     -28 17 57      Liller
          11.08611    23 50 43.0     -28 16 59        "
          12.06160    23 50 50.1     -27 37 11        "
          12.08545    23 50 50.0     -27 36 19        "
          12.13449    23 50 50.6     -27 34 22        "
          12.50000    23 50 53.51    -27 19 31.0    McNaught
          12.50069    23 50 53.60    -27 19 29.2      "
          12.50139    23 50 53.53    -27 19 28.6      "
          13.06806    23 50 58.5     -26 56 28      Liller
          13.13446    23 50 59.1     -26 53 46        "
          13.49861    23 51 03.07    -26 39 09.4    McNaught
          13.50874    23 51 03.20    -26 38 45.0      "

W. Liller (Vina del Mar, Chile).  0.2-m Schmidt.  Semiaccurate
   positions. Jan. 12.08545 position affected by nearby star.
R. H. McNaught (Siding Spring Observatory).  Uppsala Southern
   Schmidt telescope.  Comet images well condensed.

     Total magnitudes: Jan. 12.46 UT, 9.8 (G. Garradd, Tamworth,
N.S.W., 0.15-m refl.; coma 3'); 13.10, 9.9 (D. Levy, Tucson, AZ,
0.15-m refl.; coma 5'); 13.12, 9.8 (C. S. Morris, Whitaker Peak,
CA, 0.26-m refl.); 13.47, 10.0 (R. H. McNaught, 20 x 120 bin.).

     The following parabolic orbital elements, derived from eight
of the above observations, are somewhat uncertain:

           T = 1988 Mar. 26.13 ET    W =  18.88
                                     O =  19.26   1950.0
           q =   1.5441 AU           i =  84.65

     1988 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan.  5    23 50.54    -32 28.1
          10    23 50.61    -29 01.4    2.132    1.859     9.8
          15    23 51.33    -25 38.8
          20    23 52.59    -22 20.7    2.196    1.789     9.7
          25    23 54.31    -19 07.0
          30    23 56.41    -15 57.8    2.262    1.725     9.6
     Feb.  4    23 58.84    -12 52.7
           9     0 01.54    - 9 51.4    2.325    1.669     9.6


1988 January 13                (4528)              Brian G. Marsden

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