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IAUC 4444: 1987v

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                                                  Circular No. 4444
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 GEHRELS 1 (1987v)
     This comet has been recovered by J. V. Scotti, University of
Arizona, with the SPACEWATCH camera on Kitt Peak.  There is an 82"
tail in p.a. 262 deg.  Predictions on MPC 10521 and on Kobataka Circ.
No. 15 require correction by delta T = -4.4 and -3.3 days, respectively.

     1987 UT                R.A. (1950) Decl.           m1
     Aug. 29.42566      4 09 01.82     +26 37 37.7
          29.48542      4 09 05.11     +26 38 00.5
          31.42880      4 10 53.74     +26 49 43.2
          31.47502      4 10 56.27     +26 50 00.1     17.1

    The following orbital elements, by B. G. Marsden, satisfy 23
observations 1972 Oct. 11-1987 Aug. 31 with mean residual 1".2:

         T = 1987 Aug. 10.2437 ET    Epoch = 1987 July 24.0 ET
         W =  28.4814                    e =   0.510023
         O =  12.8681   1950.0           a =   6.099271 AU
         i =   9.6134                    n =   0.0654315
         q =   2.988500 AU               P =  15.063 years

     1987/88 ET   R.A. (1950) Decl.     Delta      r       m1
     Aug. 13     3 51.67    +24 53.0    3.027    2.989    17.0
          23     4 02.65    +25 57.9
     Sept. 2     4 12.32    +26 59.2    2.776    2.993    16.9
          12     4 20.40    +27 57.3
          22     4 26.62    +28 52.5    2.534    3.004    16.7
     Oct.  2     4 30.68    +29 44.5
          12     4 32.36    +30 32.7    2.324    3.021    16.5
          22     4 31.54    +31 15.6
     Nov.  1     4 28.27    +31 51.4    2.173    3.045    16.4
          11     4 22.93    +32 17.7
          21     4 16.11    +32 32.8    2.111    3.076    16.4
     Dec.  1     4 08.71    +32 36.2
          11     4 01.71    +32 29.0    2.158    3.112    16.6
          21     3 55.98    +32 14.4
          31     3 52.20    +31 55.9    2.312    3.153    16.8
     Jan. 10     3 50.74    +31 37.4
          20     3 51.70    +31 21.6    2.553    3.200    17.1
          30     3 55.01    +31 10.0
     Feb.  9     4 00.48    +31 03.3    2.851    3.251    17.5


1987 September 1               (4444)              Brian G. Marsden

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