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IAUC 5322: 1991u; 1991 OA

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IAUC number 

                                                  Circular No. 5322
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 AREND (1991u)
     S. Nakano, Sumoto, Japan, reports that T. Seki, Geisei, has
recovered this comet, as shown below.  The comet is diffuse and
somewhat condensed.  The indicated correction to the prediction on
MPC 13042 (ephemeris MPC 18469) is delta T = +0.01 day.

     1991 UT             R.A. (1950) Decl.        m1
     Aug.  1.78090    6 12 11.82   +37 42 35.1   17.5
           1.78785    6 12 12.93   +37 42 33.0
           2.77500    6 15 07.98   +37 45 06.1   18.0
           2.78403    6 15 09.62   +37 45 05.7
           7.78056    6 29 47.05   +37 54 53.8   18.5


1991 OA
     E. Bowell, Lowell Observatory, communicates the following
additional positions, measured by B. A. Skiff from exposures by H. E.
Holt, C. J. Cunningham, F. J. Mendez, C. M. Olmstead and L. A.
Zimmerman with the 0.46-m Schmidt telescope at Palomar:

     1991 UT             R.A. (1950) Decl.
     Aug.  5.28484   21 29 14.56   -10 01 23.3
           5.32135   21 29 14.37   -10 00 22.5

     Orbital elements from the five observations, July 16-Aug. 5:

     T = 1991 June 19.318 ET          Peri. = 317.221
     e = 0.59312                      Node  = 305.938   1950.0
     q = 1.03647 AU                   Incl. =   5.554
       a =  2.54738 AU     n = 0.242417     P =   4.07 years

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Aug.  2    21 28.45    -11 44.3    0.165    1.177    14.6
           7    21 29.48    - 9 16.3
          12    21 29.87    - 7 34.6    0.227    1.239    15.2
          17    21 30.09    - 6 24.7
          22    21 30.42    - 5 36.7    0.300    1.308    16.0
          27    21 31.01    - 5 04.2
     Sept. 1    21 31.98    - 4 42.4    0.383    1.381    16.8


1991 August 9                  (5322)              Brian G. Marsden

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