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IAUC 2762: 1973 IX; 1974b

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                                                  Circular No. 2762
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


COMET GIBSON (1973 IX)
     The following precise positions have been reported:

     1974 UT             R. A. (1950) Decl.        Observer
     Jan. 29.18750     2 03 01.33   -52 39 14.1    Gibson
     July 26.71528     4 40 54.0    -68 55 33      Gilmore

J. Gibson (then at Observatorio Austral Yale-Columbia, El Leoncito).
A. C. Gilmore (Carter Observatory).  Very faint, diffuse spot, more
   than 20" in diameter, on a 60-min exposure through variable
   cirrus.  It is uncertain whether the spot is the comet, and
   alternative measurements indicate that the position is uncertain
   by more than ~ 8".  Measurer: Pamela M. Kilmartin.


COMET BRADFIELD (1974b)
     The following precise position has been measured by C. Y. Shao
from a plate taken by G. Schwartz with the 155-cm reflector at the
Harvard College Observatory Agassiz Station:

     1974 UT             R. A. (1950) Decl.
     Nov. 18.96465    17 32 05.33   +22 39 16.0

     The following sets of orbital elements, by B. G. Marsden, are
from 159 observations Feb. 14 to Nov. 18.  Perturbations by Mercury
to Pluto were taken into account.  The mean residual of the
nongravitational solution is 1".23; that of the gravitational solution is
1".57, and there are systematic trends of 3" to 4".

       Nongravitational                     Gravitational
                       Epoch = 1974 Mar. 14.0 ET
    T = 1974 Mar. 18.35634 +/- 0.00007  1974 Mar. 18.35638 +/- 0.00008 ET
Peri. = 333.13024 +/- 0.00020 1         333.12982 +/- 0.00024
Node  = 143.03795 +/- 0.00033           143.03629 +/- 0.00032    1950.0
Incl. =  61.28976 +/- 0.00009            61.29016 +/- 0.00010
    q =   0.5031906 +/- 0.0000006         0.5031909 +/- 0.0000008 AU
    e =   0.9996972 +/- 0.0000255         0.9997372 +/- 0.0000066

The nongravitational parameters (Marsden, Sekanina and Yeomans
1973, Astron. J. 78, 211) are: A1 = +0.94 +/- 0.24, A2 = -0.44 +/- 0.16.


1975 March 25                  (2762)              Brian G. Marsden

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