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IAUC 4478: 1987 UA; GX 9+9

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IAUC number 

                                                  Circular No. 4478
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


1987 UA
     Another fast-moving asteroidal object has been discovered by
C. Shoemaker on films taken with the 0.46-m Schmidt telescope at
Palomar by E. Shoemaker and H. Holt, with the following
measurements by C. Shoemaker available:

       1987 UT            R. A.  (1950)    Decl.       Mag.
       Oct. 17.32483     0 22 55.50    - 0 45 41.5     16.5
            19.38073     0 27 18.12    - 2 56 11.4
            21.20981     0 31 13.40    - 4 46 07.8

     The following orbital elements by C. M. Bardwell, Center for
Astrophysics, from the above observations suggest that this is an
Amor-type object:

         T     = 1987 Oct. 6.97 ET
         Peri. = 173.36                     e =   0.2873
         Node  = 197.64   1950.0            a =   1.7007 AU
         i     =  16.09                     n =   0.44438
         q     =   1.2121 AU                P =   2.22 years

     1987 ET      R.A. (1950) Decl.     Delta      r       V
     Oct. 22     0 32.88    - 5 31.3    0.239    1.219    16.2
          27     0 43.37    - 9 50.3
     Nov.  1     0 53.65    -13 17.3    0.276    1.230    16.7
           6     1 03.68    -15 54.6
          11     1 13.42    -17 47.3    0.326    1.246    17.3
          16     1 22.90    -19 01.6
          21     1 32.16    -19 43.2    0.385    1.268    17.8
          26     1 41.27    -19 57.5
     Dec.  1     1 50.28    -19 49.4    0.450    1.293    18.2


GX 9+9
     B. E. Schaefer, Goddard Space Flight Center, writes:  "The
optical counterpart of the x-ray binary GX 9+9 is found to have a
sinusoidal modulation with amplitude 0.5 mag and period 4.198 +/-
0.008 hr.  The 212 individual observations were obtained during
June 16-27 with the 0.9-m telescope (+ CCD camera and B filter) at
Cerro Tololo Interamerican Observatory.  This period is consistent
with the x-ray period reported by Hertz and Wood (IAUC 4221)."


1987 October 26                (4478)            Daniel W. E. Green

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