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IAUC 5286: 1991p; DEBEHOGNE'S OBJECT IN Lib

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IAUC number


                                                  Circular No. 5286
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 SHOEMAKER 1 (1991p)
     P. M. Kilmartin, Mount John Observatory, reports that this comet
has been recovered by A. C. Gilmore and herself.  The images are
diffuse, and the last one is very weak.  The indicated correction to the
prediction on MPC 13046 (ephemeris on MPC 17471) is delta T = -0.6 day.

     1991 UT             R.A. (1950) Decl.        m2
     June  8.70869   21 40 31.49   -43 32 31.1    18
           8.75557   21 40 32.66   -43 32 36.2
          10.71829   21 41 19.50   -43 36 01.0
          10.74873   21 41 19.87   -43 36 03.6

     Improved orbital elements from xx observations 1984-1991:

                    Epoch = 1991 Dec. 10.0 ET
     T = 1991 Dec. 18.2230 ET         Peri. =  18.7733
     e = 0.470347                     Node  = 339.2496  1950.0
     q = 1.985757 AU                  Incl. =  26.2367
       a =  3.749162 AU    n = 0.1357697    P =   7.259 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m2
     June 13    21 42.07    -43 40.2    1.783    2.490    18.2
          23    21 43.07    -43 59.8
     July  3    21 40.11    -44 17.5    1.547    2.403    17.8
          13    21 32.97    -44 25.6
          23    21 21.94    -44 13.2    1.379    2.322    17.4
     Aug.  2    21 08.14    -43 29.2
          12    20 53.33    -42 06.2    1.297    2.245    17.1
          22    20 39.68    -40 03.3
     Sept. 1    20 28.98    -37 27.3    1.309    2.176    17.0


DEBEHOGNE'S OBJECT IN LIBRA
     Further to IAUC 5272, W. Wenzel, Sonneberg Observatory, remarks
that the brightness on the Palomar Sky Survey (cf. IAUC 5131) is strongly
enhanced as compared with imaging by ordinary photographic lenses
because of differing optical and image properties.  According to IBVS
3591, Sonneberg Sky Patrol plates during 1955 Apr. 19-21, surrounding
the Palomar observations, show nothing brighter than B approx 14.


1991 June 11                   (5286)              Brian G. Marsden

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