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IAUC 5197: 1991 DG; 1990c

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IAUC number 

                                                  Circular No. 5197
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 DG
     R. H. McNaught reports his discovery of another fast-moving
asteroidal object on a U.K. Schmidt Telescope plate taken Feb. 20 by
P. McKenzie.  The start of the trail on the Feb. 24 UKST plate taken
by M. Hartley was involved with a star; the Feb. 22 positions are
from McNaught with the Uppsala Southern Schmidt telescope:

     1991 UT             R.A. (1950) Decl.        V
     Feb. 20.46194    9 09 02.87   - 9 14 57.8   17.5
          20.51056    9 08 56.62   - 9 14 00.0
          22.57789    9 04 42.93   - 8 29 42.5
          22.59329    9 04 40.80   - 8 29 20.8
          24.68094    9 00 16.47   - 7 38 23.3
          24.69483    9 00 14.87   - 7 38 04.8

     Preliminary orbital elements by G. V. Williams, Center for
Astrophysics, from 5 positions Feb. 20-24:

     T = 1991 May  22.933 ET          Peri. =  63.402
     e = 0.37404                      Node  = 179.459   1950.0
     q = 0.90577 AU                   Incl. =  11.451
       a =  1.44701 AU     n = 0.566237     P =   1.74 years

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Feb. 23     9 03.85    - 8 20.1    0.303    1.267    17.4
          28     8 53.12    - 6 04.7
     Mar.  5     8 42.00    - 3 12.0    0.256    1.209    17.2
          10     8 30.84    + 0 18.6
          15     8 19.98    + 4 26.0    0.221    1.152    17.1
          20     8 09.71    + 9 07.3
          25     8 00.12    +14 19.4    0.197    1.097    17.2


COMET LEVY (1990c)
     Total visual magnitude estimates (cf. IAUC 5185):  Feb. 11.28
UT, 7.3 (G. W. Kronk, Troy, IL, 20x80 binoculars); 14.46, 7.6 (A.
Hale, Las Cruces, NM, 10x50 binoculars); 18.25, 7.1 (D. W. E. Green,
Harvard, MA, 12x50 binoculars); 20.09, 7.9 (H. Mikuz, Ljubljana,
Yugoslavia, 7x50 binoculars).


1991 February 25               (5197)             Daniel W. E. Green

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