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IAUC 4715: 1989 AC

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                                                  Circular No. 4715
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


1989 AC
     Further precise positions have been reported as follows:

     1989 UT             R.A. (1950) Decl.       Mag.   Observer
     Jan.  6.91944    3 59 50.68   +19 06 50.7          Maury
           6.92986    3 59 57.03   +19 07 11.3            "
           8.56701    4 16 11.36   +20 00 16.3    11    Seki
           8.57170    4 16 13.91   +20 00 25.5            "
           8.95208    4 19 45.94   +20 11 01.3          Maury
           8.95561    4 19 47.51   +20 11 04.8            "
          10.96984    4 37 08.29   +20 59 14.9          Shao
          11.27153    4 39 30.07   +21 05 20.5          Balam
          12.49218    4 48 44.89   +21 28 33.7    12    McNaught
          12.49683    4 48 46.88   +21 28 37.0            "

A. Maury (Caussols).  0.9-m Schmidt.  Measurer R. Chemin.
T. Seki (Geisei).  0.6-m reflector.  Communicated by T. Kobayashi.
C.-Y. Shao (Oak Ridge Observatory).  1.5-m reflector.
D. D. Balam and J. B. Tatum (University of Victoria).
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt.

     The Jan. 12 observations from the southern hemisphere have improved
the determinacy of the orbit, and it seems likely that the object has a
in the range 2.5-2.6 AU, i.e., perhaps a 3:1 libration with Jupiter.  An
estimate by A. Hale, Las Cruces, NM, mv = 12.1 on Jan. 8.16 UT, yields
H about 14.5.  The following orbital elements are from 12 observations
Jan. 4-12:

     T = 1988 Nov. 22.832 ET          Peri. = 275.223
     e = 0.65354                      Node  = 126.984   1950.0
     q = 0.90003 AU                   Incl. =   0.474
       a =  2.59782 AU     n = 0.235391     P =   4.19 years

     1989 ET      R.A. (1950) Decl.     Delta      r        V
     Jan. 24     5 49.50    +23 02.6
          26     5 56.82    +23 07.7    0.330    1.266    13.7
          28     6 03.55    +23 11.2
          30     6 09.76    +23 13.3    0.373    1.302    14.0
     Feb.  1     6 15.54    +23 14.4
           3     6 20.96    +23 14.5    0.418    1.338    14.3
           5     6 26.06    +23 13.9
           7     6 30.89    +23 12.7    0.466    1.374    14.6


1989 January 13                (4715)              Brian G. Marsden

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