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IAUC 4171: 1986a; 1985l

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                                                  Circular No. 4171
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 SHOEMAKER 3 (1986a)
     Further precise positions have been reported as follows:

    1986 UT           R.A.  (1950.0)  Decl.     m1   Observer

    Jan. 18.47264    9 36 01.44   +21 36 52.8        Gibson
         18.47778    9 36 01.45   +21 36 55.1          "
         20.26563    9 36 05.25   +21 50 19.1        Louys
         20.28854    9 36 05.66   +21 50 19.1        Gibson
         20.29722    9 36 05.64   +21 50 23.3          "
         20.40694    9 36 05.32   +21 51 12.5          "
         20.40833    9 36 05.31   +21 51 13.1          "
         20.52792    9 36 04.93   +21 52 05.2          "
         20.52958    9 36 04.92   +21 52 05.9          "
         21.25868    9 36 05.06   +21 57 41.2        Louys
         21.71875    9 36 04.26   +22 00 55.0   14   Koishikawa
         21.73160    9 36 04.22   +22 01 00.2          "
         21.74653    9 36 04.20   +22 01 07.8          "
         22.26215    9 36 03.42   +22 05 07.2        Louys

J. Gibson (Palomar).  1.5-m reflector and CCD.
L. Louys (European Southern Observatory).  0.4-m GPO astrograph.
   Measurer: R. M. West.
M. Koishikawa (Sendai-Ayashi).  Communicated by S. Nakano.

     Orbital elements from 28 observations Jan. 10-22:

         T = 1985 Dec. 19.100 ET
     Peri. =  15.176                    e =   0.72182
     Node  =  96.518   1950.0           a =   6.43993 AU
     Incl. =   6.376                    n =   0.060309
         q =   1.79145 AU               P =  16.34 years


COMET HARTLEY-GOOD (1985l)
     M. C. Pande, Uttar Pradesh State Observatory, communicates
further spectroscopic observations by P. S. Goraya, B. S. Rautela
and B. B. Sanwal (cf. IAUC 4150, where Goraya and Rautela should
have been listed as observers) on 1985 Nov. 25.6, 26.6, 28.6, 29.6,
30.6, Dec. 1.6 and 3.6 UT.  C3 emission was weakening, and CN, C2
and Na emissions were increasing as the comet approached the sun.

     Total visual magnitude estimate by J. E. Bortle, Stormville,
NY (20 x 80 binoculars): 1986 Jan. 12.44 UT, 8.6.


1986 January 31                (4171)              Brian G. Marsden

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