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IAUC 4558: 1988d; AX Per

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                                                  Circular No. 4558
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


PERIODIC COMET HARTLEY 3 (1988d)
     The following additional positions have been reported:

   1988 UT            R. A.  (1950)  Decl.        m1     Observer
   Feb. 19.39271    10 12 27.07   - 3 01 10.3            Shoemaker
        19.44132    10 12 24.74   - 3 01 07.2               "
        22.50434    10 09 52.50   - 2 56 20.9            Hartley
        22.57219    10 09 49.31   - 2 56 15.3               "
        23.54322    10 09 01.60   - 2 54 29.4    17.5       "
        25.60628    10 07 20.45   - 2 50 24.5               "

E. and C. Shoemaker (Palomar Obs.).  0.46-m Schmidt telescope.
M. Hartley (Siding Spring Observatory).  U.K. Schmidt telescope.
   Feb. 22 positions are improved measures (cf. IAUC 4553) by R. H.
   McNaught.  Feb. 23 and 25 positions measured by Hartley.

     The following orbital elements, from 6 observations Feb. 19-
25, indicate that this is a short-period comet:

         T     = 1987 Aug. 1.09 ET
         Peri. = 172.48                    e = 0.3187
         Node  = 286.03   1950.0           a = 3.5746 AU
         i     =  11.37                    n = 0.14583
         q     =   2.4353 AU               P = 6.76 years

     1988 ET      R.A. (1950) Decl.     Delta      r       m1
     Feb. 29    10 04.64    - 2 42.7    1.777    2.748    16.6
     Mar.  5    10 00.86    - 2 29.3
          10     9 57.41    - 2 14.2    1.826    2.774    16.7
          15     9 54.39    - 1 58.1
          20     9 51.86    - 1 41.7    1.901    2.801    16.9
          25     9 49.88    - 1 25.6
          30     9 48.49    - 1 10.4    1.999    2.828    17.0
     Apr.  4     9 47.68    - 0 56.6
           9     9 47.47    - 0 44.5    2.115    2.856    17.2


AX PERSEI
     Visual magnitude estimates (cf. IAUC 4549):  Feb. 17.13 UT,
10.0 (P. Collins, Scottsdale, AZ); 20.88, 9.8 (M. Verdenet,
Bourbon-Lancy, France); 23.87, 10.2 (A. Pereira, Linda-A-Velha,
Portugal); 27.83, 9.9 (Pereira); 29.17, 9.5 (Collins).


1988 March 1                   (4558)            Daniel W. E. Green

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