Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4296: 1987a; OJ 287

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 4295  SEARCH Read IAUC 4297
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

Read IAUC 4295  SEARCH Read IAUC 4297


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!