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IAUC 5100: 1990 SP; 1990c

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IAUC number 

                                                  Circular No. 5100
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


1990 SP
     R. H. McNaught, University of Adelaide, reports his discovery
of a fast-moving asteroidal object on a U.K. Schmidt plate exposed
Sept. 20 by P. McKenzie.  McNaught provides the following measurements,
which include prediscovery U.K. Schmidt plates exposed by M. Hartley
and follow-up Uppsala Southern Schmidt films exposed by McNaught:

     1990 UT             R.A. (1950) Decl.        V     Observer
     Aug. 18.76968    1 11 25.72   -32 03 54.9          Hartley
     Sept.10.71742    1 21 12.71   -41 09 02.5            "
          20.66399    1 13 42.34   -46 05 49.8   16     McKenzie
          21.78742    1 12 06.75   -46 40 44.6          McNaught
          22.74162    1 10 39.24   -47 10 44.9            "
          24.62750    1 07 23.40   -48 10 20.8            "

     Preliminary orbital elements from the above observations by
G. V. Williams, Center for Astrophysics:

                    Epoch = 1990 Nov.  5.0 ET
     T = 1990 Dec. 14.893 ET          Peri. =  47.892
     e = 0.38953                      Node  =  45.389   1950.0
     q = 0.82935 AU                   Incl. =  13.569
       a =  1.35855 AU     n = 0.622429     P =   1.58 years

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     Sept.16     1 18.50    -43 43.4    0.321    1.246    16.2
          21     1 13.23    -46 16.4
          26     1 04.62    -48 53.9    0.262    1.185    15.8
     Oct.  1     0 51.71    -51 32.9
           6     0 33.03    -54 09.8    0.209    1.122    15.4
          11     0 06.29    -56 38.2
          16    23 28.02    -58 43.4    0.161    1.060    15.1


COMET LEVY (1990c)
     Total visual magnitude estimates:  Sept. 15.15 UT, 4.9 (C. S.
Morris, Pine Mountain Club, CA, 10x50 binoculars); 17.15, 5.0
(Morris); 24.54, 5.4 (A. Pearce, Scarborough, W.A., 20x80 binoculars).


1990 September 25              (5100)             Daniel W. E. Green

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