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IAUC 5373: 1991 TF3; MWC 560

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IAUC number 

                                                  Circular No. 5373
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


1991 TF3
     C. S. Shoemaker has discovered another fast-moving asteroidal
object.  The following precise positions are available:

     1991 UT             R.A. (1950) Decl.       Mag.   Observer
     Oct.  2.34600    0 22 18.00   + 6 36 23.0   16.7   Shoemaker
           2.37517    0 22 13.89   + 6 38 57.2            "
           7.27482    0 14 55.56   +12 25 16.6   17       "
           7.31545    0 14 51.87   +12 27 31.3            "
          12.28941    0 10 13.72   +16 13 04.2   17.0   Lawrence
          12.31233    0 10 12.38   +16 13 55.2            "

C. S. Shoemaker, E. M. Shoemaker and D. H. Levy (Palomar).  0.46-m
   Schmidt telescope.  Measurer C. S. Shoemaker.
K. Lawrence, P. Rose and R. Bambery (Palomar).  0.46-m Schmidt
   telescope.  Measurer J. Alu.  Communicated by E. Helin.

     Preliminary orbital elements from the above observations by
B. G. Marsden, Center for Astrophysics:

     T = 1991 Aug. 11.993 ET          Peri. = 303.234
     e = 0.53106                      Node  =   6.030   1950.0
     q = 0.95736 AU                   Incl. =  14.048
       a =  2.04153 AU     n = 0.337886     P =   2.92 years

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Oct. 11     0 11.21    +15 23.6    0.215    1.208    16.8
          21     0 06.82    +20 01.7
          31     0 08.11    +22 11.6    0.403    1.352    18.8
     Nov. 10     0 13.41    +23 16.9
          20     0 21.81    +23 55.2    0.634    1.503    20.1


MWC 560
     Visual magnitude estimates (cf. IAUC} 5137):  Jan. 7.97 UT, 9.7
(P. Schmeer, Bischmisheim, Germany); Mar. 3.98, 9.7 (Schmeer); Apr.
1.90, 9.6 (A. Pereira, Cabo da Roca, Portugal); May 13.88, 9.5
(Pereira); Sept. 17.21, 9.6 (Pereira); Oct. 5.18, 9.8 (Schmeer);
11.18, 9.9 (Schmeer); 16.18, 10.3 (Pereira); 18.16, 10.5 (Schmeer).


1991 October 24                (5373)             Daniel W. E. Green

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