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IAUC 5199: 1991 DA; SW UMa

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                                                  Circular No. 5199
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 DA
     J. English and K. Freeman, Australian National University,
report that a preliminary examination of I CCD frames, taken in
moonlight on 1991 Feb. 25 with the 1-m reflector (+ EEV CCD) at Siding
Spring, shows the object to be asteroidal with no evidence of coma
around the trailed image.
     Additional positions from R. H. McNaught using the Uppsala
Southern Schmidt telescope at Siding Spring:

     1991 UT             R.A. (1950) Decl.
     Feb. 22.62053    9 07 54.91   -73 05 54.4
          23.71089    9 00 25.49   -73 17 32.5
          23.76493    9 00 03.62   -73 18 01.6
          24.73738    8 53 22.03   -73 26 52.7
          25.74491    8 46 28.56   -73 34 31.3

     Orbital elements by G. V. Williams, Center for Astrophysics,
 from 10 observations, Feb. 18-25:

     T = 1990 Dec.  2.574 ET          Peri. = 190.927
     e = 0.82630                      Node  = 312.930   1950.0
     q = 1.57294 AU                   Incl. =  61.556
       a =  9.05561 AU     n = 0.036168     P =  27.25 years

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Feb. 23     9 05.3     -73 10.1    1.490    1.868    17.1
          28     8 31.3     -73 46.5
     Mar.  5     7 59.5     -73 50.3    1.577    1.934    17.2
          10     7 32.3     -73 29.2
          15     7 10.6     -72 51.2    1.667    2.004    17.4
          20     6 54.2     -72 03.4
          25     6 42.6     -71 11.2    1.758    2.077    17.6
          30     6 35.1     -70 18.4
     Apr.  4     6 30.75    -69 27.4    1.849    2.152    17.7


SW URSAE MAJORIS
     P. Schmeer, Bischmisheim, Germany, reports the following
visual magnitude estimates:  Feb. 24.91 UT, [13.3; 25.857, 11.3;
25.922, 11.2.


1991 February 26               (5199)             Daniel W. E. Green

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