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IAUC 5026: 1990d

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                                                  Circular No. 5026
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


PERIODIC COMET PETERS-HARTLEY (1990d)
     R. H. McNaught, Siding Spring Observatory, reports his recovery
of this comet with the Uppsala Southern Schmidt telescope, as
given below; the coma is noted as diffuse.  The indicated
correction to the elements on MPC 12128 is Delta(T) = +2.0 days.

     1990 UT             R.A. (1950) Decl.        m1
     May  26.44271   11 51 27.91   -38 55 48.2    14
          29.59606   11 58 22.56   -37 30 58.9    14

     The improved orbital elements by the undersigned are from
21 observations 1982-1990, mean residual 1".1:

                    Epoch = 1990 July  8.0 ET
     T = 1990 June 23.6412 ET         Peri. = 338.3169
     e = 0.597926                     Node  = 259.3939  1950.0
     q = 1.625774 AU                  Incl. =  29.8345
       a =  4.043467 AU    n = 0.1212197    P =   8.131 years

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     May   9    11 20.57    -46 13.2    0.888    1.693    13.2
          19    11 36.60    -42 11.0
          29    11 57.05    -37 47.1    0.871    1.648    13.0
     June  8    12 20.72    -33 16.8
          18    12 46.35    -28 55.0    0.918    1.627    13.0
          28    13 13.00    -24 54.2
     July  8    13 39.92    -21 23.4    1.032    1.633    13.3
          18    14 06.60    -18 25.5
          28    14 32.79    -16 00.1    1.204    1.665    13.7
     Aug.  7    14 58.38    -14 03.7
          17    15 23.31    -12 31.3    1.419    1.720    14.3
          27    15 47.64    -11 18.0
     Sept. 6    16 11.42    -10 18.6    1.664    1.796    14.9
          16    16 34.69    - 9 28.7
          26    16 57.53    - 8 44.5    1.930    1.889    15.6

     Visual observation by P. Camilleri, Cobram, Victoria
(0.20-m reflector):  May 27.40 UT, m1 = 13, coma diameter 3'-4'.


1990 May 29                    (5026)             Daniel W. E. Green

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