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IAUC 5030: 1990c; 1989c1

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                                                  Circular No. 5030
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


COMET LEVY (1990c)
     The following parabolic orbital elements, from 24 observations
May 21-June 5, are still preliminary, the ephemeris position in
mid-August being uncertain by at least 1 degree (the ephemeris has
m1 varying as r to the inverse fourth power):

     T = 1990 Oct. 24.359 ET          Peri. = 242.579
                                      Node  = 138.570   1950.0
     q = 0.93849 AU                   Incl. = 131.623

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     June  8     0 03.37    +28 29.9    2.577    2.359     9.8
          13     0 04.99    +28 45.3
          18     0 06.15    +29 00.1    2.291    2.236     9.3
          23     0 06.76    +29 13.7
          28     0 06.67    +29 25.6    1.992    2.111     8.7
     July  3     0 05.73    +29 34.8
           8     0 03.72    +29 40.4    1.684    1.986     8.1
          13     0 00.36    +29 40.5
          18    23 55.22    +29 32.7    1.370    1.861     7.4
          23    23 47.71    +29 12.5
          28    23 36.96    +28 33.1    1.059    1.735     6.5
     Aug.  2    23 21.68    +27 22.0
           7    22 59.97    +25 17.4    0.763    1.611     5.5
          12    22 29.10    +21 39.1
          17    21 45.81    +15 20.9    0.520    1.488     4.3
          22    20 48.37    + 5 15.8
          27    19 41.01    - 7 37.8    0.428    1.369     3.5
     Sept. 1    18 35.05    -19 16.8
           6    17 40.33    -27 07.9    0.556    1.256     3.7


COMET AUSTIN (1989c1)
     Total visual magnitude estimates (cf. IAUC 5022):  May 25.97 UT,
5.4 (J.-C. Merlin, Le Creusot, France, 7x50 binoculars); 27.13, 5.5
(V. F. de Assis Neto, Sao Francisco de Oliveira, Brazil, 10x70
binoculars); 31.03, 6.2 (H. Mikuz, Ljubljana, Yugoslavia, 7x50
binoculars); June 1.06, 6.1 (P. Schmeer, Bischmisheim, W. Germany,
20x80 binoculars); 3.42, 6.0 (C. S. Morris, Pine Mountain Club, CA,
10x50 binoculars; tail about 3.5 deg long); 5.31, 5.8 (J. E. Bortle,
Stormville, NY, 10x50 binoculars).


1990 June 7                    (5030)             Daniel W. E. Green

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