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IAUC 5285: 1991o; 1678

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IAUC number 

                                                  Circular No. 5285
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


PERIODIC COMET CHERNYKH (1991o)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his recovery
of this comet on Spacewatch images by himself and D. Rabinowitz.  On
June 10.460 there was a coma about 8" across and a faint tail extending
more than 8" in p.a. 252 deg.  The indicated correction to the
prediction on MPC 14592 (ephemeris on MPC 17841) is delta T = -2.4 days.

     1991 UT             R.A. (1950) Decl.        m2
     June  8.41137   23 10 57.02   - 6 57 29.9
           8.42829   23 10 58.09   - 6 57 25.1
           8.44484   23 10 58.93   - 6 57 22.2   20.3
          10.45954   23 12 50.14   - 6 49 11.0
          10.46803   23 12 50.72   - 6 49 09.3

     Improved orbital elements from 240 observations 1977-1991:

                    Epoch = 1992 Jan. 19.0 ET
     T = 1992 Jan. 25.4417 ET         Peri. = 263.1948
     e = 0.593637                     Node  = 129.7432  1950.0
     q = 2.356269 AU                  Incl. =   5.0821
       a =  5.798435 AU    n = 0.0705891    P =  13.963 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m2
     June 13    23 15.12    - 6 39.2    2.768    3.012    20.0
          23    23 23.43    - 6 05.4
     July  3    23 30.56    - 5 41.0    2.424    2.918    19.6
          13    23 36.29    - 5 27.8
          23    23 40.39    - 5 27.3    2.112    2.828    19.1
     Aug.  2    23 42.70    - 5 40.5
          12    23 43.06    - 6 07.8    1.855    2.743    18.7
          22    23 41.48    - 6 48.2
     Sept. 1    23 38.15    - 7 38.6    1.676    2.663    18.4
          11    23 33.50    - 8 34.5
          21    23 28.24    - 9 29.3    1.595    2.590    18.1
     Oct.  1    23 23.22    -10 16.3
          11    23 19.30    -10 49.8    1.615    2.526    18.1


PERIODIC COMET D'ARREST = COMET LA HIRE (1678)
     Corrigendum.  On IAUC 5283, line 7, for  eight  read  four.


1990 June 11                   (5285)              Brian G. Marsden

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