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IAUC 5826: 1993m

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                                                  Circular No. 5826
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


PERIODIC COMET HARTLEY 3 (1993m)
     J. V. Scotti, University of Arizona, reports his recovery of
this comet with the Spacewatch telescope at Kitt Peak.  On June 23,
the comet exhibited a coma of diameter 10" and a tail 0'.54 long in
p.a. 255 deg, and m2 = 22.1; the comet was close to a star of mag
14 on June 24 (measures slightly uncertain).

     1993 UT             R.A. (2000) Decl.        m1
     June 23.43707    1 40 51.19   +21 40 45.4
          23.44496    1 40 51.79   +21 40 49.2   19.5
          23.45118    1 40 52.21   +21 40 52.2   19.7
          24.44795    1 42 02.95   +21 49 40.3
          24.45394    1 42 03.37   +21 49 42.9
          24.45990    1 42 03.89   +21 49 46.1

The comet's position is off slightly from the prediction on MPC
18257, such that Delta(T) about +0.49 day.  The following orbital
elements by the undersigned are from 27 observations, 1988-1993
(mean residual 0".7):

                    Epoch = 1994 May   8.0 TT
     T = 1994 May  20.8684 TT         Peri. = 168.4583
     e = 0.316911                     Node  = 287.8791  2000.0
     q = 2.461681 AU                  Incl. =  11.6954
       a =  3.603750 AU    n = 0.1440695    P =   6.841 years

1993 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July 12     2 01.93   +24 20.2   3.182   3.049   73.3   18.6   19.3
     22     2 12.34   +25 41.7   3.026   3.020   80.0   19.3   19.1
Aug.  1     2 21.82   +26 59.6   2.869   2.990   86.9   19.8   18.9
     11     2 30.15   +28 13.1   2.711   2.961   94.1   20.0   18.7
     21     2 37.05   +29 21.3   2.556   2.933  101.6   19.7   18.5
     31     2 42.18   +30 23.0   2.406   2.904  109.6   19.1   18.4
Sept.10     2 45.27   +31 16.5   2.264   2.876  117.9   18.0   18.2
     20     2 45.99   +31 59.3   2.132   2.849  126.7   16.4   18.0
     30     2 44.18   +32 28.4   2.015   2.822  136.0   14.3   17.8
Oct. 10     2 39.90   +32 40.3   1.915   2.795  145.4   11.7   17.6
     20     2 33.46   +32 31.7   1.837   2.769  154.5    8.9   17.5
     30     2 25.61   +32 01.0   1.784   2.744  161.6    6.5   17.3
Nov.  9     2 17.38   +31 09.6   1.757   2.720  163.1    6.1   17.2


1993 June 29                   (5826)            Daniel W. E. Green

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