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IAUC 4471: 1987y

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                                                  Circular No. 4471
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 LEVY (1987y)
     The following additional precise positions have been reported:

  1987 UT            R. A.  (1950)   Decl.        m1     Observer
  Oct. 15.11187    14 56 46.80    +16 46 34.6            Balam
       15.37517    14 58 19.31    +16 43 47.4     9      Ueda
       15.38895    14 58 23.97    +16 43 37.6              "
       17.40507    15 10 03.57    +16 19 41.6    10.5    Seki

D. D. Balam (University of Victoria).
S. Ueda (Kushiro).  0.16-m reflector.  Measured by H. Kaneda.
T. Seki (Geisei).  Tail 60' long in p.a. 0 deg.

     The following preliminary orbital elements by the undersigned
are from 4 observations, Oct. 13-17:

         T = 1987 Sept. 9.16 ET      Peri. =  13.33
                                     Node  = 143.13   1950.0
         q =   0.5171 AU             i     =  62.51

     1987 ET     R. A. (1950) Decl.     Delta      r       m1
     Oct. 12    14 37.97    +17 19.0    1.547    0.901     9.5
          14    14 50.15    +16 59.0
          16    15 01.98    +16 36.6    1.586    0.968     9.9
          18    15 13.43    +16 12.4
          20    15 24.52    +15 46.6    1.632    1.035    10.2
          22    15 35.23    +15 19.7
          24    15 45.58    +14 52.0    1.685    1.103    10.6
          26    15 55.57    +14 23.9
          28    16 05.21    +13 55.5    1.744    1.170    10.9
          30    16 14.51    +13 27.2
     Nov.  1    16 23.47    +12 59.1    1.808    1.237    11.2

     Total visual magnitude estimates: Oct. 14.10 UT, 9.3 (A. Hale,
Las Cruces, NM, 0.20-m reflector); 15.10, 9.2 (D. Levy, Tucson, AZ,
0.20-m reflector); 16.00, 9.3 (G. R. Chester, Rixeyville, VA, 0.14-
m reflector; photograph shows 5' tail in p.a. 355 deg).


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     A. Hale, Las Cruces, NM, reports an outburst of this comet, as
indicated by the following total visual magnitude estimates (0.41-m
reflector):  Oct. 16.22 UT, 13.2; 17.14, 13.3.

1987 October 17                (4471)            Daniel W. E. Green

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