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IAUC 2816: 1975i; 1973 EA

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IAUC number 

                                                  Circular No. 2816
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 CHURYUMOV-GERASIMENKO (1975i)
     Dr. Elizabeth Roemer, University of Arizona, reports that this
comet has been recovered on a single exposure with the Steward
Observatory's 229-cm reflector on Kitt Peak.  R. A. McCallister
assisted.  The following position of the well-condensed image indicates
that the prediction on IAUC 2783 requires correction by Delta-T =
+0.43 day; that by N. A. Belyaev on Kiev Komet. Tsirk. No. 180
requires correction by Delta-T = -0.39 day.

     1975 UT          R. A. (1950) Decl.       m2
     Aug.  8.33847   20 48.85    -29 12.2    ~19.5


1973 EA
     The following improved orbital elements, by B. G. Marsden, are
from 15 observations 1973 Mar. 6 to Oct. 22.  The ephemeris is not
expected to be in error by more than 2'.

       T = 1975 Oct. 2.2425 ET    Epoch = 1975 Sept. 25.0 ET
   Peri. = 267.5691                   e =   0.649519
   Node  = 356.7265   1950.0          a =   1.776212 AU
   Incl. =  39.8475                   n =   0.4163532
       q =  0.622528 AU               P =   2.367 years

     1975/76 ET  R. A. (1950) Decl.     Delta     r     Mag.
     Sept.25    12 48.51    -22 30.2    1.389   0.635   18.7
     Oct.  5    13 41.16    -30 45.1
          15    14 52.84    -37 10.2    1.097   0.661   18.8
          25    16 23.54    -39 28.4
     Nov.  4    17 57.45    -36 13.1    0.969   0.831   19.1
          14    19 15.47    -28 52.6
          24    20 13.75    -20 20.9    1.087   1.047   19.5
     Dec.  4    20 57.49    -12 26.5
          14    21 31.97    - 5 41.0    1.362   1.264   20.2
          24    22 00.68    - 0 00.5
     Jan.  3    22 25.75    + 4 48.6    1.695   1.467   20.8
          13    22 48.47    + 8 59.1
          23    23 09.63    +12 41.1    2.036   1.655   21.3
     Feb.  2    23 29.75    +16 01.7
          12    23 49.17    +19 06.4    2.360   1.826   21.1


1975 August 13                 (2816)              Brian G. Marsden

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