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IAUC 3731: 1982f; Cyg X-3

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IAUC number 

                                                  Circular No. 3731
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


PERIODIC COMET CHURYUMOV-GERASIMENKO (1982f)
     The following orbital elements, by the undersigned, satisfy
50 observations during 1969-1982 with mean residual 1".7.
Perturbations by all nine planets were taken into account, and
non-gravitational parameters (Style II) were determined to be
A1 = -0.83 +/- 0.25, A2 = +0.0294 +/- 0.0049

         T = 1982 Nov. 12.1040 ET    Epoch 1982 Nov. 7.0 ET
     Peri. =  11.3282                    e =   0.629182
     Node  =  50.3601   1950.0           a =   3.522234 AU
     Incl. =   7.1130                    n =   0.1490997
         q =   1.306108 AU               P =   6.610 years

     1982/83 ET  R.A. (1950) Decl.        p        r       m1

     Sept.28     4 11.55    +14 05.5    0.609    1.411    11.2
     Oct.  8     4 40.18    +16 46.6
          18     5 09.47    +19 42.8    0.487    1.340    10.3
          28     5 38.47    +22 52.4
     Nov.  7     6 05.96    +26 10.8    0.415    1.308     9.8
          17     6 30.16    +29 30.8
          27     6 49.39    +32 42.3    0.391    1.318     9.8
     Dec.  7     7 02.51    +35 33.6
          17     7 09.26    +37 51.1    0.413    1.370    10.1
          27     7 10.90    +39 22.6
     Jan.  6     7 09.87    +40 03.0    0.489    1.457    10.9
          16     7 08.71    +39 56.1
          26     7 09.46    +39 12.6    0.626    1.569    11.9
     Feb.  5     7 13.04    +38 05.2
          15     7 19.50    +36 44.3    0.826    1.699    13.0

     Total visual magnitude estimates and coma diameters by C. S.
Morris, Harvard, MA (0.25-m reflector): Sept. 18.26 UT, 12.9, 1';
19.25, 12.9, 1'.2.


CYGNUS X-3
     P. A. Feldman, J. M. MacLeod, B. H. Andrew and R. Glaeser,
Herzberg Institute of Astrophysics, report the detection of strong
radio emission (4.0-3.6 Jy) from the binary x-ray source Cyg X-3.
The measurements were made during Oct. 5.2-6.0 UT at 10.65 GHz
with the 46-m telescope of the Algonquin Radio Observatory.


1982 October 8                 (3731)              Brian G. Marsden

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