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IAUC 2766: 1975c

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                                                  Circular No. 2766
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


PERIODIC COMET KOHOUTEK (1975c)
     The following precise positions have been reported:

     1975 UT             R. A. (1950) Decl.        m1    Observer
     Mar.  7.52813     4 55 06.27   +20 25 26.8   15     Seki
          10.25764     5 02 33.04   +20 28 18.6          Hestir
          16.55278     5 19 44.6    +20 31 48     16     Seki
          16.83819     5 20 32.28   +20 31 46.6  15-16   Kohoutek
          16.85278     5 20 34.73   +20 31 47.5            "
          17.84722     5 23 17.96   +20 31 51.0  15-16     "
          18.52465     5 25 08.7    +20 31 59     16     Seki

T. Seki (Kochi Observatory, Geisei Station).  From Orient. Astron.
   Assoc. Comet Bull. No. 101.  40-cm reflector.
K. Hestir (Joint Observatory for Cometary Research).  37-cm f/2
   Schmidt camera.  Measurer: E. F. Tedesco.
L. Kohoutek (Hamburg Observatory, Bergedorf).  Comet diffuse with
   condensation.  Measurer: M. Dieckvoss (also on IAUC 2755).

     The following improved orbital elements, by B. G. Marsden, are
from 11 observations Feb. 9 to Mar. 17.  They indicate that the
comet passed only 0.15 AU from Jupiter in July 1972 and that before
then q = 2.4 AU, P = 8.2 years.

       T = 1975 Jan. 18.124 ET
   Peri. = 169.714                    e =   0.53450
   Node  = 273.218   1950.0           a =   3.36636 AU
   Incl. =   5.416                    n =   0.159575
       q =   1.56705 AU               P =   6.176 years

     1975 ET     R. A. (1950) Decl.     Delta     r      m2
     Apr. 18     6 47.11    +19 27.4    1.791   1.798   19.3
          28     7 12.83    +18 40.0
     May   8     7 37.73    +17 41.0    2.049   1.896   19.8
          18     8 01.78    +16 31.6
          28     8 24.95    +15 13.3    2.321   2.002   20.3
     June  7     8 47.24    +13 47.5
          17     9 08.70    +12 15.3    2.598   2.115   20.8
          27     9 29.34    +10 38.1
     July  7     9 49.24    + 8 57.1    2.869   2.231   21.3

              m2 = 15.5 + 5 log Delta + 10 log r


1975 April 10                  (2766)              Brian G. Marsden

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