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IAUC 4952: 1990 BG; 1989v

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                                                  Circular No. 4952
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 BG
     A fast-moving asteroidal object has been discovered by Eleanor
Helin and Brian Roman on Palomar 0.46-m Schmidt films taken by them
and K. Lawrence.  The following measurements are by Roman:

     1990 UT             R.A. (1950) Decl.       Mag.
     Jan. 21.30990    7 09 39.67   +31 26 00.1   15.8
          22.29132    7 05 55.42   +32 08 12.9
          24.17344    6 58 33.83   +33 28 38.7   15.0
          24.43698    6 57 29.36   +33 39 46.8
          25.25990    6 54 11.67   +34 14 30.0

     Orbital elements from the above observations:

     T = 1990 May  18.110 ET          Peri. = 135.243
     e = 0.57293                      Node  = 109.822   1950.0
     q = 0.63904 AU                   Incl. =  36.059
       a =  1.49632 AU     n = 0.538477     P =   1.83 years

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     Jan.  9     7 49.13    +22 52.9    0.690    1.670    15.1
          14     7 34.87    +26 13.5
          19     7 18.16    +29 46.2    0.623    1.597    15.0
          24     6 59.25    +33 21.3
          29     6 38.71    +36 47.5    0.596    1.520    15.2
     Feb.  3     6 17.35    +39 55.4
           8     5 56.12    +42 39.6    0.602    1.438    15.4
          13     5 35.86    +44 58.7
          18     5 17.25    +46 55.3    0.630    1.353    15.6


COMET HELIN-ROMAN-ALU (1989v)
     Total visual magnitude estimates: 1989 Dec. 17.02 UT, 10.5 (G.
Kronk, Troy, IL, 0.33-m reflector); 20.16, 10.0 (C. S. Morris, Whitaker
Peak, CA, 0.26-m reflector); 24.76, 10.3 (J.-C. Merlin, Le Creusot,
France, 0.15-m reflector); 30.10, 10.9 (Morris); 1990 Jan. 1.54, 11.2
(A. Hale, Las Cruces, NM, 0.41-m reflector); 23.06, 11.4 (B. H.
Granslo, Blindern, Norway, 0.15-m reflector); 24.51, 11.1 (Hale).


1990 January 25                (4952)              Brian G. Marsden

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