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IAUC 5001: 1989c1

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                                                  Circular No. 5001
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)
     D. G. Schleicher and D. J. Osip, Lowell Observatory, write:
"Aperture photometry obtained on Apr. 26 using the Lowell 1.07-m
telescope yield Haser model production rates:  log Q(C2) = 26.6, log
Q(CN) = 26.6, and log Q(OH) = 28.7.  The C2 and CN production rates
are similar to those measured in mid-March (IAUC 4983), as is the
measured dust production, with log (A f rho) = 3.1.  These values
may be up to 20 percent too low due to changing sky conditions.
Corresponding magnitudes of C2 (514.0 nm) and continuum (484.5 nm)
in a 75"-diameter aperture were 5.0 and 7.8, respectively."
     The following post-perihelion precise positions have been
reported:

     1990 UT             R.A. (1950) Decl.       Observer
     Apr. 25.49375    0 34 56.36   +35 53 27.3   Helin
          26.47083    0 29 57.87   +35 57 38.9   Bus
          26.47986    0 29 55.09   +35 57 39.4     "
          26.76775    0 28 26.12   +35 58 22.8   Okamura
          26.76917    0 28 25.71   +35 58 22.8     "
          26.77066    0 28 25.23   +35 58 23.2     "
          26.77375    0 28 24.20   +35 58 24.3     "
          26.77625    0 28 23.44   +35 58 24.8     "
          26.77750    0 28 23.10   +35 58 24.4     "

E. Helin, B. Roman, K. Lawrence, and R. Lopes (Palomar).  0.46-m
  Schmidt telescope.  Measured by Roman.
S. J. Bus (Lowell Observatory, Anderson Mesa Station).  0.33-m
  telescope.  Measured by B. A. Skiff.  Communicated by E. Bowell.
  Straight ion tail in p.a. 310 deg.
S. Okamura (Kiso).

     The following orbital elements, by the undersigned, satisfy 57
observations 1989 Dec. 6-1990 Apr. 26 (mean residual 0".8):

                    Epoch = 1990 Apr. 19.0 ET
     T = 1990 Apr.  9.96739 ET        Peri. =  61.56934
     e = 1.0002278                    Node  =  75.22965 1950.0
     q = 0.3497735 AU                 Incl. =  58.95559


1990 April 27                  (5001)             Daniel W. E. Green

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