Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4302: 1987c

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 4301 SEARCH Read IAUC 4303
IAUC number 

                                                  Circular No. 4302
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 NISHIKAWA-TAKAMIZAWA-TAGO (1987c)
     The following precise positions have been reported (except the
Jan. 19 position, which is an improved measure by H. Kosai, from a
sketch by N. Nishikawa, of the position published on IAUC 4300):

   1987 UT            R.A.  (1950)  Decl.        m1    Observer
   Jan. 19.483      0 04.2        + 6 52               Nishikawa
        21.38507    0 01 29.00    + 6 07 05.3    9     Koishikawa
        21.39306    0 01 28.21    + 6 06 54.7              "
        21.40104    0 01 27.17    + 6 06 47.0              "
        21.99584    0 00 29.51    + 5 53 24.7    9     Shao
        22.38542   23 59 52.80    + 5 44 56.0          Koishikawa
        22.39606   23 59 51.84    + 5 44 39.8              "
        22.40625   23 59 50.88    + 5 44 24.4              "
        22.41667   23 59 49.89    + 5 44 10.8              "

M. Koishikawa (Sendai Observatory, Ayashi Station).  0.20-m reflector.
   On Jan. 21, diffuse 8' coma with weak central condensation.
   Measured by T. Tsumagari.  Communicated by H. Kosai.
C.-Y. Shao (Oak Ridge Observatory).  0.4-m astrograph.  Measured by
   D. W. E. Green.  Strong condensation; short tail to the NE.

     Preliminary parabolic orbital elements, by the undersigned,
from the above observations:

         T = 1987 Feb. 18.03 ET      Peri. = 137.54
                                     Node  = 156.56   1950.0
         q =   1.0498 AU             i     = 174.14

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan.  5     0 51.63    +16 35.1    0.737    1.276     7.4
          10     0 29.33    +12 11.3
          15     0 14.40    + 9 01.0    1.015    1.192     7.8
          20     0 03.87    + 6 39.9
          25    23 56.10    + 4 51.8    1.293    1.124     8.1
          30    23 50.14    + 3 26.2
     Feb.  4    23 45.40    + 2 16.3    1.549    1.076     8.3
           9    23 41.49    + 1 17.5
          14    23 38.17    + 0 26.7    1.767    1.052     8.5

     Visual magnitude estimates:  Jan. 22.11 UT, 8.1 (A. Hale, Las
Cruces, NM, 0.20-m reflector); 22.12, 8.6: (C. S. Morris, Mt.
Gleason, CA, 0.26-m reflector).


1987 January 23                (4302)            Daniel W. E. Green

Read IAUC 4301 SEARCH Read IAUC 4303

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

Valid HTML 4.01!