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IAUC 4972: 1989c1; 1989e1

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IAUC number 

                                                  Circular No. 4972
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 orbital elements below, by B. G. Marsden, Center for
Astrophysics, from MPC 16001, are based on observations through
Feb. 19.  The corresponding 'original' 1/a = -0.00041 +/- 0.00016,
supporting the statement on IAUC 4958 that the comet is probably
'new' in the Oort sense.

                    Epoch = 1990 Apr. 19.0 ET
     T = 1990 Apr.  9.9761 ET         Peri. =  61.5546
     e = 1.000380                     Node  =  75.2132  1950.0
     q = 0.349957 AU                  Incl. =  58.9596

     The predicted magnitudes in the following ephemeris are mean
values of the formulae used on IAUC 4926 and 4958.

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar. 30     1 45.69    +11 22.1    1.255    0.468     2.8
     Apr.  4     1 46.50    +18 14.8
           9     1 40.86    +25 03.4    1.048    0.351     1.4
          14     1 26.76    +30 35.9
          19     1 06.26    +34 04.9    0.810    0.434     1.6
          24     0 42.60    +35 43.6
          29     0 16.84    +36 00.2    0.601    0.625     2.4
     May   4    23 47.93    +35 07.4
           9    23 13.16    +32 54.6    0.418    0.830     2.6
          14    22 28.20    +28 34.7
          19    21 27.99    +20 25.7    0.273    1.029     2.6
          24    20 11.62    + 6 48.5
          29    18 50.46    - 9 09.8    0.249    1.219     3.0
     June  3    17 41.91    -20 54.8
           8    16 52.58    -27 27.6    0.387    1.401     4.4


COMET SKORICHENKO-GEORGE (1989e1)
     Total visual magnitude estimates:  Jan. 20.75 UT, 9.5 (R. Haver,
Tolfa, Italy, 15x80 binoculars); 26.43, 9.8 (J. Kobayashi, Kumamoto,
Japan, 0.31-m reflector); Feb. 5.76, 8.9 (S. Korth, Dusseldorf, West
Germany, 15x80 binoculars); 21.97, 9.6 (O. Midtskogen, Tranby, Norway,
0.32-m reflector); 27.01, 9.5 (J. E. Bortle, Stormville, NY, 0.32-m
reflector).


1990 February 27               (4972)             Daniel W. E. Green

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