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IAUC 5397: 1991d1; 1991b1

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IAUC number 

                                                  Circular No. 5397
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 SHOEMAKER-LEVY 7 (1991d1)
     The following additional positions have been reported:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     Nov. 28.50139    3 25 12.83   +42 32 07.5    17    Seki
          28.63888    3 25 10.67   +42 30 48.3            "
     Dec.  5.15394    3 24 43.69   +41 22 19.1          McCrosky
           5.17341    3 24 43.55   +41 22 06.7            "

T. Seki (Geisei).  Communicated by S. Nakano.
R. E. McCrosky (Oak Ridge).  1.55-m reflector + CCD.

     Orbital elements by B. G. Marsden, Harvard-Smithsonian Center
for Astrophysics, from seven observations, Nov. 13-Dec. 5:

     T = 1991 Oct. 27.3096 ET         Peri. =  91.7535
     e = 0.542469                     Node  = 312.3191  1950.0
     q = 1.628858 AU                  Incl. =  10.2625
       a =  3.560102 AU    n = 0.1467271    P =   6.717 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Nov. 30     3 25.00    +42 17.5    0.712    1.663    16.6
     Dec.  5     3 24.73    +41 24.1
          10     3 25.21    +40 24.9    0.747    1.685    16.8
          15     3 26.56    +39 22.3
          20     3 28.80    +38 18.5    0.801    1.713    17.0
          25     3 31.93    +37 15.3
          30     3 35.89    +36 14.1    0.872    1.745    17.3


PERIODIC COMET SHOEMAKER-LEVY 6 (1991b1)
     Total visual magnitude estimates (cf. IAUC 5386):  Nov. 14.29
UT, 11.4 (A. Hale, Tucumcari, NM, 0.20-m reflector); 25.11, 11.8
(Hale, Las Cruces, NM, 0.41-m reflector); 29.98, 12.4 (A. Boattini,
Monte Morello, Italy, 0.20-m reflector); Dec. 3.85, 12.8 (H. Mikuz,
Ljubljana, Yugoslavia, 0.20-m reflector).


1991 December 5                (5397)             Daniel W. E. Green

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