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IAUC 3432: 1947 XC = 1979 XA

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IAUC number 

                                                  Circular No. 3432
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 617-864-5758


1947 XC = 1979 XA
     E. Helin, California Institute of Technology, informs us that
1979 XA (cf. IAUC 3430) was discovered by Q. R. Passey and S. J.
Bus on exposures with the 0.46-m Schmidt telescope at Palomar.  T.
Christian assisted with the observations.  The following precise
positions have been reported:

     1979 UT             R. A. (1950) Decl.       Mag.   Observer
     Dec. 13.13681     2 36 45.02   +14 20 30.3   14.5   Passey
          13.34236     2 35 39.61   +14 16 52.3            "
          14.10139     2 31 45.34   +14 03 16.4            "
          14.25069     2 30 56.68   +14 00 33.0            "
          14.27431     2 30 52.21   +14 00 14.4   14     Bowell
          14.39792     2 30 08.99   +13 57 48.1          Passey
          15.03354     2 26 48.42   +13 45 55.4          Bulger
          15.09929     2 26 26.48   +13 44 40.2          Shao

Q. R. Passey and S. J. Bus (Palomar Mountain Observatory).
E. Bowell (Lowell Observatory, Anderson Mesa Station).  0.3-m
   photographic telescope.  Measurer: M. L. Kantz.  Photoelectric
   observations on Dec. 15.2 UT gave V = 14.5, B-V = +0.86.
J. H. Bulger and C.-Y. Shao (Harvard College Observatory, Agassiz
   Station).  0.4-cm astrograph and 1.5-m reflector.

     J. G. Williams, Jet Propulsion Laboratory, suggested that 1979
XA = 1947 XC (Object Giclas; cf. IAUC 1131, MPC 242).  Subsequent
computations by B. G. Marsden confirmed the identity, although the
number of revolutions since 1947 is uncertain.  Direct calculations
from the 1979 observations indicate 11.5 +/- 2 revolutions.  The
results below are from an approximate linkage of the apparitions
(including perturbations) on the assumption of 10 revolutions.

       T = 1980 Feb. 17.775 ET    Epoch = 1979 Nov. 23.0 ET
   Peri. =  96.874                    e =   0.71631
   Node  =  76.268  1950.0            a =   2.17354 AU
   Incl. =   2.583                    n =   0.307576
       q =   0.61661 AU               P =   3.20 years

     1981 ET     R. A. (1950) Decl.     Delta     r      B
     Dec. 13     2 37.44    +14 23.1    0.317   1.249   15.5
          18     2 10.45    +12 46.6
          23     1 40.82    +10 50.6    0.266   1.130   15.4
          28     1 08.83    + 8 34.6


1979 December 17               (3432)              Brian G. Marsden

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