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IAUC 5248: 1991e; 1991k

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IAUC number 

                                                  Circular No. 5248
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-LEVY 3 (1991e)
     No observations have been reported of this object since February.
Further astrometry is therefore requested; significant reports
of non-detection would be useful.  Extension to the ephemeris on
IAUC 5205:

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Apr. 24     9 09.17    +13 12.3
     May   4     9 16.93    +12 36.0    2.440    2.724    17.3
          14     9 26.22    +11 51.7
          24     9 36.79    +10 59.6    2.711    2.744    17.5
     June  3     9 48.37    +10 00.2
          13    10 00.77    + 8 54.1    2.978    2.767    17.8
          23    10 13.82    + 7 41.6
     July  3    10 27.36    + 6 23.6    3.228    2.794    18.0


PERIODIC COMET MRKOS (1991k)
     Improved orbital elements from MPC 18081:

     T = 1991 Mar. 18.9902 ET         Peri. = 180.4239
     e = 0.550370                     Node  =   0.9778  1950.0
     q = 1.408729 AU                  Incl. =  31.3609
       a =  3.133087 AU    n = 0.1777237    P =   5.546 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Apr. 14    11 25.29    -29 14.0    0.493    1.436    14.0
          24    11 07.13    -34 23.2
     May   4    10 57.90    -37 49.0    0.652    1.492    14.8
          14    10 56.71    -40 12.4
          24    11 02.25    -42 01.3    0.846    1.572    15.6
     June  3    11 13.15    -43 31.6
          13    11 28.36    -44 51.1    1.057    1.671    16.3
          23    11 47.09    -46 03.9
     July  3    12 08.68    -47 11.2    1.282    1.783    17.0

     Total visual magnitude estimates (cf. IAUC 5221):  Apr. 14.28
UT, 14.1 (C. S. Morris, Lockwood Valley, CA, 0.51-m reflector);
16.62, 14.2 (A. Pearce, Dowerin, W.A., 0.41-m reflector); 17.62,
14.1 (Pearce).


1991 April 22                  (5248)             Daniel W. E. Green

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