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IAUC 5304: 1991t

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                                                  Circular No. 5304
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 HARTLEY 2 (1991t)
     G. R. Kastel', Institute for Theoretical Astronomy, reports the
following rough positions of a comet discovered by T. V. Kryachko at
Majdanak.  The object was diffuse and condensed with a coma 15' across.

     1991 UT           R.A. (1950) Decl.       m1
     July  9.854       1 01.5      +20 15      11
           9.938       1 02.0      +20 05
          10.875       1 06.2      +20 40      11

     S. Nakano, Sumoto, Japan, has suggested that this is P/Hartley 2,
a correction of delta T = -5.6 days being necessary to his prediction
on MPC 13046.  As a result, R. E. McCrosky and C.-Y. Shao were able to
confirm the comet and its identification with the 1.5-m reflector at
Oak Ridge Observatory, as follows:

     1991 UT             R.A. (1950) Decl.
     July 12.31995    1 12 48.80   +21 21 05.9
          12.32387    1 12 49.88   +21 21 12.4
          12.32899    1 12 51.28   +21 21 20.8
          12.33093    1 12 51.82   +21 21 23.9

     Orbital elements by the undersigned from 20 observations 1986-1991:

                    Epoch = 1991 Sept. 21.0 ET
     T = 1991 Sept. 11.6515 ET        Peri. = 174.9274
     e = 0.719504                     Node  = 226.0600  1950.0
     q = 0.953226 AU                  Incl. =   9.2552
       a =  3.398363 AU    n = 0.1573256    P =   6.265 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     July 13     1 16.06    +21 39.6    0.909    1.290    11.9
          18     1 41.22    +23 51.3
          23     2 08.64    +25 52.9    0.834    1.203    11.3
          28     2 38.23    +27 38.3
     Aug.  2     3 09.72    +29 01.4    0.788    1.124    10.7
           7     3 42.58    +29 56.5
          12     4 16.08    +30 20.3    0.772    1.055    10.3
          17     4 49.41    +30 11.7
          22     5 21.82    +29 32.7    0.786    1.001    10.0


1991 July 12                   (5304)              Brian G. Marsden

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