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IAUC 4921: 1989c1; 1989a1

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IAUC number 

                                               Circular No. 4921
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


COMET AUSTIN (1989c1)
     The following additional precise positions have been reported:

     1989 UT             R.A. (1950) Decl.       Observer
     Dec.  8.70486    0 48 43.63   -61 34 25.6   Lowe
           9.55486    0 47 25.45   -61 18 07.8     "
          11.44201    0 44 41.70   -60 40 51.1   Gilmore
          11.44444    0 44 41.52   -60 40 48.1     "

G. Lowe (Perth Observatory, Bickley).  Communicated by P. V. Birch.
A. C. Gilmore and P. M. Kilmartin (Mount John University Observatory).
   0.6-m reflector.  Through cirrus cloud.

     The following preliminary parabolic orbital elements from 10
observations, Dec. 6-11, suggest that this may become a moderately
bright object in 1990 March and April:

     T = 1990 Apr. 10.304 ET          Peri. =  61.850
                                      Node  =  74.839   1950.0
     q = 0.34878 AU                   Incl. =  59.053

     1989/90      R.A. (1950) Decl.     Delta      r       m1
     Dec. 10     0 46.76    -61 09.5    2.336    2.396    11.1
          15     0 40.22    -59 27.0
          20     0 35.32    -57 35.7    2.269    2.249    10.8
          25     0 31.92    -55 36.5
          30     0 29.87    -53 30.2    2.201    2.098    10.4
     Jan.  4     0 29.03    -51 17.3
           9     0 29.25    -48 58.3    2.129    1.942    10.0
          14     0 30.42    -46 33.2
          19     0 32.43    -44 02.0    2.052    1.781     9.6


COMET AARSETH-BREWINGTON (1989a1)
     Total visual magnitude estimates (cf. IAUC 4916):  Dec. 2.71 UT,
6.8 (O. Midtskogen, Tranby, Norway, 0.32-m reflector); 5.04, 5.8 (D.
Levy, Tucson, AZ, 0.15-m reflector; 1.5-deg tail in p.a. 350 deg);
7.24, 5.7 (B. H. Granslo, Blindern, Norway, 0.06-m refractor; 1-deg
tail in p.a. 347 deg); 9.45, 5.8 (J. E. Bortle, Stormville, NY, 10x50
binoculars; 0.9-deg tail in p.a. 353 deg); 11.23, 5.0 (H. Dahle, Oslo,
Norway, 7x50 binoculars; 12' tail in p.a. 345 deg).


1989 December 11               (4921)             Daniel W. E. Green

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