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IAUC 6446: P/1996 P1

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                                                  Circular No. 6446
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1996 P1 (IRAS)
     R. M. McNaught, Anglo-Australian Observatory, reports his
recovery of comet P/1983 M1 (= 1983j = 1983 XIV) on a plate taken
by Q. A. Parker.  The following observations yield an indicated
correction to the prediction by K. Muraoka on MPC 22033 (ephemeris
on MPC 25985) of Delta(T) = -1.65 days:

     1996 UT             R.A. (2000) Decl.        m1    Observer
     Aug.  8.70684    0 41 55.57   -62 34 47.4   13     Parker
           9.56843    0 39 43.05   -62 35 33.4          Garradd
           9.56937    0 39 43.00   -62 35 33.6            "
           9.57040    0 39 42.77   -62 35 33.5            "
           9.57224    0 39 42.51   -62 35 33.7            "
           9.57298    0 39 42.30   -62 35 33.4            "

Q. A. Parker (Siding Spring).  U.K. Schmidt telescope.  Measured by
 McNaught.  Comet strongly condensed with 1'.0 fan tail toward
 p.a. 290 deg.
G. Garradd (Loomberah).  0.25-m f/4.1 reflector + CCD.

     The following improved orbital elements by the undersigned are
from 85 observations 1983-1996 (mean residual 1".0):

                    Epoch = 1996 Nov. 13.0 TT
     T = 1996 Oct. 29.9968 TT         Peri. = 356.8876
     e = 0.696589                     Node  = 357.7007  2000.0
     q = 1.702690 AU                  Incl. =  45.9617
       a =  5.611833 AU    n = 0.0741390    P =  13.294 years

1996 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug.  5     0 50.44   -62 27.8   1.224   1.940  119.8   27.0   12.2
     10     0 38.56   -62 35.8   1.178   1.916  121.7   26.8   12.0
     15     0 23.72   -62 31.4   1.134   1.892  123.5   26.5   11.8
     20     0 06.21   -62 09.0   1.093   1.870  125.2   26.2   11.6
     25    23 46.69   -61 22.7   1.057   1.848  126.7   26.0   11.5
     30    23 26.15   -60 07.5   1.025   1.828  127.9   25.8   11.3
Sept. 4    23 05.72   -58 19.9   0.998   1.809  128.7   25.8   11.1
      9    22 46.50   -55 58.9   0.977   1.792  129.1   25.9   11.0
     14    22 29.33   -53 05.9   0.963   1.776  128.8   26.2   10.9
     19    22 14.70   -49 45.1   0.956   1.761  127.9   26.8   10.8
     24    22 02.78   -46 02.3   0.956   1.748  126.3   27.6   10.8

                      (C) Copyright 1996 CBAT
1996 August 9                  (6446)            Daniel W. E. Green

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