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IAUC 3582: 1981b; 1980q

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IAUC number 

                                                  Circular No. 3582
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


PERIODIC COMET BUS (1981b)
     S. J. Bus, currently observing with the U.K. Schmidt Telescope
Unit at Siding Spring, has measured the following positions from
further exposures with the 1.2-m Schmidt telescope.  The first two
are prediscovery observations; the Feb. 9 image again shows a faint
tail ~ 20" long to the northwest.

     1981 UT             R. A. (1950) Decl.       m1     Observer
     Feb.  9.64757    11 59 16.76   - 1 11 45.8 19.5-20  K. S. Russell
          13.64028    11 58 57.89   - 1 05 50.9   20     M. Hartely
     Mar.  7.62836    11 50 44.45   + 0 15 57.6  16.5    S. J. Bus

     The following elliptical elements, by B. G. Marsden, satisfy
the nine observations Feb. 9-Mar. 7 within 2":

       T = 1981 June 19.970 ET
   Peri. =  28.052                    e =   0.38345
   Node  = 181.467   1950.0           a =   3.50801 AU
   Incl. =   2.601                    n =   0.150007
       q =   2.16285 AU               P =   6.57 years

     1981 ET     R. A. (1950) Decl.     Delta     r      m1
     Feb. 25    11 55.97    - 0 33.3    1.371   2.313   16.8
     Mar.  7    11 51.10    + 0 12.6
          17    11 44.93    + 1 09.0    1.272   2.267   16.6
          27    11 38.53    + 2 08.1
     Apr.  6    11 33.01    + 3 01.5    1.274   2.229   16.5
          16    11 29.39    + 3 41.9
          26    11 28.29    + 4 04.5    1.362   2.199   16.6
     May   6    11 29.97    + 4 07.4
          16    11 34.42    + 3 50.6    1.512   2.178   16.8
          26    11 41.39    + 3 15.6
     June  5    11 50.58    + 2 24.5    1.698   2.166   17.0
          15    12 01.69    + 1 19.3
          25    12 14.40    + 0 02.5    1.903   2.163   17.2


COMET MEIER (1980q)
     Total visual magnitude estimates: Jan. 25.44 UT, 8.8 (J.
Bortle, Stormville, NY, 20 x 80 bin.); Feb. 3.46, 10.7 (P. Maley,
Houston, TX, 0.13-m refractor); 13.43, 9.0 (Bortle).


1981 March 10                  (3582)              Brian G. Marsden

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