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IAUC 4296: 1987a; OJ 287

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IAUC number 

                                                  Circular No. 4296
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 617-495-7244/7440/7444


COMET LEVY (1987a)
     The Jan. 5 observation given on IAUC 4295 is substantially in
error, and the Jan. 8 observation is to be discounted.  Accurate
and semiaccurate positions have been reported as follows:

    1987 UT            R.A. (1950) Decl.        m1   Observer
    Jan.  8.8352    17 15 38      + 9 25.5      12   Kakei
          8.84688   17 15 37.21   + 9 25 19.9   11   Seki
          8.86250   17 15 36.53   + 9 25 01.4          "
          9.8441    17 14 42      + 9 07.0           Kakei
          9.84792   17 14 41.65   + 9 06 54.8   11   Seki
         10.51420   17 14 04.54   + 8 54 36.0   12   Skiff
         10.52993   17 14 03.58   + 8 54 19.0          "
         11.51394   17 13 08.25   + 8 36 05.5   12     "
         11.53409   17 13 07.37   + 8 35 39.4          "

W. Kakei (Nihondaira Observatory).  0.13-m hyperboloid astrocamera.
T. Seki (Geisei).  0.6-m reflector.
B. A. Skiff (Lowell Observatory, Anderson Mesa station).  Measurers
   S. J. Bus and E. Bowell.  Comet diffuse, slight condensation.

     Parabolic orbital elements from the above observations:

           T = 1986 Dec. 18.31 ET    W =  96.70
                                     O =  15.96   1950.0
           q =   0.9319 AU           i =  97.17

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan.  5    17 19.14    +10 35.3    1.476    0.983    10.8
          10    17 14.55    + 9 04.2
          15    17 09.80    + 7 30.7    1.431    1.052    11.0
          20    17 04.74    + 5 54.3
          25    16 59.19    + 4 14.3    1.353    1.141    11.2
          30    16 52.92    + 2 29.8
     Feb.  4    16 45.66    + 0 39.6    1.250    1.245    11.4


OJ 287
     A. Sillanpaa, Turku University Observatory, reports that the
predicted minimum phase (Sillanpaa et al., Turku Informo No. 108)
in the BL-Lac object OJ 287 has begun.  The following V magnitudes
(accuracy better than 0.15 mag) were obtained photographically
with the 0.7-m Schmidt: Jan. 2, 16.0; 4, 15.5; 6, 15.8; 9, 16.0.


1987 January 12                (4296)              Brian G. Marsden

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