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IAUC 2944: 1975 YA; 1975b

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IAUC number 

                                                  Circular No. 2944
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


1975 YA
     E. Roemer provides the following precise positions, obtained
with the Steward Observatory's 229-cm reflector, Kitt Peak:

     1976 UT             R. A. (1950) Decl.        Note
     Jan. 27.08889    21 03 45.88   +47 26 31.3      1
     Mar. 26.46580    21 04 12.42   +36 52 45.8      2
          26.49788    21 04 12.80   +36 52 24.6      2

Note 1.  D. Daniels assisted.  Measurer: W. Smith.
Note 2.  C. A. Heller assisted.  Measurer: C. D. Vesely.

     The following improved elements, by the undersigned, are based
on 21 observations 1975 Dec. 27 to 1976 Mar. 26:

       T = 1976 Feb. 14.9769 ET   Epoch = 1976 Mar. 3.0 ET
   Peri. =  61.6686                   e =   0.298230
   Node  =  93.7398   1950.0          a =   1.290173 AU
   Incl. =  64.0135                   n =   0.6725619
       q =   0.905404 AU              P =   1.465 years

     Indicated corrections to the ephemeris on IAUC 2913 are:

     1976 ET   dR.A.   dDecl.   1976 ET   dR.A.   dDecl.
     Apr. 22   +0m18   - 3'5    June 11   +1m09   -15'5
     May   2   +0.27   - 4.5         21   +1.22   -22.3
          12   +0.41   - 5.9    July  1   +0.87   -26.3
          22   +0.59   - 7.8         11   +0.12   -24.5
     June  1   +0.82   -10.6         21   -0.46   -20.5


PERIODIC COMET WEST-KOHOUTEK-IKEMURA (1975b)
     R. M. West, European Southern Observatory, provides the following
re-reduction of his discovery measurements (cf. IAUC 2751):

     1974 UT             R. A. (1950) Decl.
     Oct. 15.1285      1 05 50.08   -49 57 56.3
          15.1701      1 05 47.12   -49 57 53.3

     L. Kohoutek, Hamburg Observatory, communicates the following
measurements (end-figures only), by M. Dieckvoss, of the same
plate: 50s.17, 58".0; 47s.16, 54".0.


1976 April 20                  (2944)              Brian G. Marsden

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