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IAUC 4522: (2212)

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IAUC number 

                                                  Circular No. 4522
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


(2212) HEPHAISTOS
     G. R. Harvey, Concord, NC, writes that his recent visual
observation indicated that the published ephemeris for this Apollo
object (EMP 1987, pp. 350-351) is in error by more than 15'.  The
following precise positions have been reported:

   1987 UT            R.A. (1950) Decl.         V    Observer
   Dec. 18.43749   12 08 10.74   +25 23 11.6          McCrosky
        30.62606   13 57 31.58   +16 35 13.7   15.4   Tholen
        30.64609   13 57 44.23   +16 33 54.1   15.3     "

R. E. McCrosky (Oak Ridge Observatory).  Measurer C.-Y. Shao.
D. J. Tholen (Mauna Kea).  2.24-m reflector encoder positions.

     The following improved orbital elements have been derived by
C. M. Bardwell, Center for Astrophysics, from 51 observations
obtained in 1978, 1979-1980, 1986 and 1987:

         T = 1988 Feb. 11.4369 ET    Epoch = 1987 Dec. 31.0 ET
         W = 208.0706                    e =   0.835045
         O =  28.0142   1950.0           a =   2.163881 AU
         i =  11.8824                    n =   0.3096379
         q =   0.356943 AU               P =   3.183 years

     1987/88 ET   R.A. (1950) Decl.     Delta      r       V
     Dec. 23    12 44.13    +23 04.9    0.536    1.118    14.9
          25    13 01.80    +21 44.2
          27    13 20.63    +20 09.0    0.489    1.056    14.7
          29    13 40.57    +18 17.8
          31    14 01.49    +16 10.2    0.454    0.992    14.7
     Jan.  2    14 23.20    +13 46.5
           4    14 45.46    +11 08.4    0.434    0.926    14.8
           6    15 07.98    + 8 19.0
           8    15 30.46    + 5 22.6    0.432    0.859    15.0
          10    15 52.59    + 2 24.1
          12    16 14.13    - 0 31.7    0.449    0.790    15.2
          14    16 34.86    - 3 20.4
          16    16 54.68    - 5 58.9    0.484    0.720    15.6
          18    17 13.50    - 8 25.1
          20    17 31.35    -10 37.9    0.536    0.649    15.8
          22    17 48.26    -12 37.2
          24    18 04.35    -14 23.3    0.603    0.578    15.9


1988 January 1                 (4522)              Brian G. Marsden

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