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IAUC 3797: 1983d; 1982k

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IAUC number 

                                                  Circular No. 3797
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 617-864-5758


COMET IRAS-ARAKI-ALCOCK (1983d)
     The following parabolic orbital elements have been derived by
the undersigned from the semiaccurate positions on Apr. 25, the
accurate positions on Apr. 27 and May 2 and Porter's rough position
on May 4.  The ephemeris is necessarily uncertain but shows
that the comet should pass close to the earth on May 11 (possibly
closer than any comet with the exception of P/Lexell in 1770):

           T = 1983 May 21.24 ET Peri. = 192.82
                                 Node  =  48.42   1950.0
           q =   0.9913 AU       Incl. =  73.39

    1983 ET       R.A. (1950.0) Decl.      p        r       m1

    May   4.0    18 53.97    +53 07.0    0.193    1.035     6.1
          5.0    18 49.65    +54 22.2
          6.0    18 43.36    +56 02.2    0.143    1.025     5.4
          7.0    18 33.43    +58 21.1

          8.0    18 15.64    +61 44.8    0.095    1.017     4.5
          8.5    18 00.31    +64 04.4
          9.0    17 35.64    +66 58.4    0.071    1.013     3.8
          9.5    16 51.0     +70 26.9
         10.0    15 20.4     +73 40.8    0.050    1.010     3.0
         10.5    12 42.4     +72 35.6
         11.0    10 29.42    +61 32.8    0.034    1.007     2.2
         11.5     9 22.67    +42 09.0
         12.0     8 48.41    +21 12.0    0.034    1.004     2.2
         12.5     8 28.43    + 4 39.1
         13.0     8 15.51    - 6 40.7    0.049    1.001     2.9
         13.5     8 06.52    -14 18.0
         14.0     7 59.93    -19 35.0    0.070    0.999     3.7
         14.5     7 54.88    -23 23.5
         15.0     7 50.90    -26 14.5    0.093    0.997     4.3
         15.5     7 47.67    -28 26.5
         16.0     7 45.01    -30 11.2    0.118    0.995     4.8


PERIODIC COMET KOPFF (1982k)
     Total visual magnitude estimates: Mar. 20.09 UT, 12.7 (J.-C.
Merlin, Le Creusot, France, 0.26-m reflector); Apr. 13.31, 11.0
(J. Bortle, Stormville, NY, 0.32-m reflector); 15.95, 11.2 (
Merlin); 18.26, 10.9 (C. S. Morris, Harvard, MA, 0.25-m reflector).


1983 May 4                     (3797)              Brian G. Marsden

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