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IAUC 4934: 1989c1; 1989r

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IAUC number 

                                              Circular No. 4934
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)
     E. E. Roettger and P. D. Feldman, Johns Hopkins University;
and M. F. A'Hearn, University of Maryland, report:  "We obtained
observations of the ultraviolet spectrum of comet Austin with
the International Ultraviolet Explorer on Dec. 22.3 UT.  From
the observed OH emission rate, a water production rate of 1.5 x
10E29 molecules sE-1 is derived.  For comparison, interpolation
of IUE data on P/Halley 1986 III for the same preperihelion
heliocentric distance (2.2 AU) gives a water production rate of
0.7 x 10E29 molecules sE-1.  The dust-to-gas ratio appears to be
slightly higher than that of P/Halley."
     Total visual magnitude estimates (cf. IAUC 4924):  Dec. 20.58
UT, 10.8 (A. Pearce, Scarborough, W. Australia, 0.20-m reflector);
22.47, 9.6 (D. A. J. Seargent, The Entrance, N.S.W., 15x80 binoculars);
26.56, 9.6 (G. Garradd, Tamworth, N.S.W., 10x50 binoculars);
28.59, 10.1 (Pearce, 20x80 binoculars); 29.53, 9.3 (T. Lovejoy,
Northcote West, Victoria, 15x80 binoculars).


COMET OKAZAKI-LEVY-RUDENKO (1989r)
     Extension to the ephemeris on IAUC 4918:

     1989/90      R.A. (1950) Decl.     Delta      r       m1
     Dec. 30     3 26.8     -82 44.0    0.990    1.158     9.1
     Jan.  4     2 34.0     -78 56.3
           9     2 14.8     -75 34.9    1.222    1.310    10.1
          14     2 06.8     -72 42.2
          19     2 04.0     -70 13.4    1.447    1.461    10.9
          24     2 03.97    -68 04.0
          29     2 05.78    -66 10.5    1.662    1.611    11.7
     Feb.  3     2 08.85    -64 30.5
           8     2 12.81    -63 02.0    1.863    1.758    12.3
          13     2 17.47    -61 43.3
          18     2 22.69    -60 33.2    2.050    1.903    12.9
          23     2 28.37    -59 30.9
          28     2 34.46    -58 35.6    2.222    2.045    13.3
     Mar.  5     2 40.89    -57 46.9
          10     2 47.62    -57 04.3    2.380    2.185    13.8


1989 December 30               (4934)             Daniel W. E. Green

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