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IAUC 5306: 1991q

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                                                  Circular No. 5306
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 LEVY (1991q)
     Further precise positions have been reported as follows:

     1991 UT             R.A. (1950) Decl.       Observer
     June 26.75868    2 39 53.31   +22 13 53.7   Ikari
          26.76354    2 39 54.49   +22 14 08.0     "
     July  8.79410    3 39 25.85   +29 07 33.8   Seki
           9.79271    3 44 27.96   +29 36 04.7     "
           9.79497    3 44 28.80   +29 36 08.6     "
           9.79618    3 44 29.13   +29 36 10.0     "
          12.34222    3 57 20.64   +30 44 26.7   McCrosky
          12.34340    3 57 21.01   +30 44 28.6     "
          12.34546    3 57 21.61   +30 44 31.6     "
          13.34714    4 02 25.34   +31 09 39.8     "
          13.34823    4 02 25.68   +31 09 42.2     "

Y. Ikari (Ohtsu).  0.16-m f/2.5 Schmidt.
T. Seki (Geisei).  0.6-m reflector.  Communicated by S. Nakano.
R. E. McCrosky and C.-Y. Shao (Oak Ridge).  1.5-m reflector + CCD.

     Orbital computations show that this comet has a revolution period
of some 35-60 years and that when perihelion passage is in September a
close approach to the earth is possible.  S. Nakano and D. W. E. Green
have independently suggested identity with comet 1499, but the number
of intervening revolutions is uncertain.

     T = 1991 July 8.185 ET           Peri. =  41.472
     e = 0.92728                      Node  = 328.693   1950.0
     q = 0.98217 AU                   Incl. =  19.182
       a = 13.50559 AU     n = 0.019858     P =  49.63 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     July 13     4 00.66    +31 01.1    1.364    0.985     8.6
          18     4 25.87    +32 53.6
          23     4 50.80    +34 22.2    1.435    1.013     8.8
          28     5 15.18    +35 28.1
     Aug.  2     5 38.75    +36 13.2    1.515    1.065     9.2
           7     6 01.33    +36 40.2
          12     6 22.76    +36 51.5    1.595    1.137     9.6
          17     6 42.94    +36 50.0
          22     7 01.82    +36 38.0    1.672    1.225    10.0


1991 July 13                   (5306)              Brian G. Marsden

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