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IAUC 4069: 1985e

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                                                  Circular No. 4069
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 617-495-7244/7440/7444


COMET MACHHOLZ (1985e)
     The following accurate/semi-accurate positions are available:

      1985 UT            R.A.   (1950.0)  Decl.       Observer
      May  28.45486     0 55 16.77    +15 38 04.5     Harlan
           28.46875     0 55 20.11    +15 38 17.1       "
           29.7359      1 02 51.7     +16 13 06       Kurosu
           29.7473      1 02 55.6     +16 13 16         "
           29.78646     1 03 09.0     +16 14 22       Seki
           30.40486     1 06 57.93    +16 31 21.9     Briggs

J. Briggs and E. Everhart (Chamberlin Observatory field station).
   Measured by Everhart.
G. Harlan (Lick Observatory).  Ends of trail; 0.51-m twin
  astrograph. Measured by B. Jones.
K. Kurosu (Sendai Obs.).  0.41-m reflector; reduced by S. Kasahara.
  Second observation of lower accuracy.  Large coma of magnitude 9
  with moderate condensation; communicated by S. Nakano.
T. Seki (Geisei).  0.60-m reflector; communicated by Nakano.

     The following parabolic elements, by the undersigned, are
based on the above observations and are very uncertain.  Accurate
positions are urgently needed to assure that the comet is not lost
following conjunction in late June.

         T = 1985 June 28.76 ET   Peri. = 274.16
                                  Node  = 194.96   1950.0
         q =   0.1069 AU          Incl. =  16.22

     1985 ET     R.A. (1950.0) Decl.      p        r       m1
     May  31     1 10.70    +16 48.0    1.268    0.938     9.2
     June  2     1 23.92    +17 43.7
           4     1 38.21    +18 39.6    1.193    0.841     8.6
           6     1 53.63    +19 34.7
           8     2 10.28    +20 27.9    1.130    0.739     8.0
          10     2 28.22    +21 18.0
          12     2 47.49    +22 03.4    1.084    0.631     7.2
          14     3 08.11    +22 42.1

     Total visual magnitude estimates: May 29.46 UT, 8.9 (G.
Rattley, Magma, AZ, 0.25-m reflector); 29.48, 9.5 (D. Machholz, San
Jose, CA, 0.15-m reflector); 30.46, 9.2 (Machholz, 0.25-m refl.).
The observation by A. Hale on IAUC 4067 was made at May 28.52 UT.


1985 May 31                    (4069)            Daniel W. E. Green

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