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IAUC 3436: 1947 XC = 1979 XA; SS 433

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IAUC number 

                                                  Circular No. 3436
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
     Further precise positions have been reported as follows:

     1979 UT             R. A. (1950) Decl.       Mag.   Observer
     Dec. 14.26389     2 30 52.21   +14 00 14.4   14     Bowell
          16.46424     2 19 01.5    +13 18 04            Furuta
          16.47014     2 18 59.3    +13 17 57              "
          17.15417     2 15 11.22   +13 03 59.1          Giclas
          17.61042     2 12 35.20   +12 54 27.9   15.0   Seki
          17.63090     2 12 28.63   +12 54 04.0            "
          18.00833     2 10 22.45   +12 46 06.0          McCrosky

E. Bowell and H. L. Giclas (Lowell Observatory).  Measurer: M. L.
   Kantz.  The Dec. 14 position corrects that on IAUC 3432.
T. Furuta (Tokai) and T. Seki (Geisei).  Communicated by Y. Kozai
   and H. Kosai, Tokyo Astronomical Observatory.
R. E. McCrosky, C.-Y. Shao and G. Schwartz (Harvard Observatory).

     Photoelectric observations on Dec. 16 and 17, made by Bowell
and reduced by A. Harris, gave B-V = +0.82 +/- 0.02, U-B = +0.36 +/-
0.03.  V varied over 14.45-14.55, apparently with a long period.

     The number of revolutions since 1947 is still ambiguous.  The
following ephemeris continues that on IAUC 3432:

     1979/80 ET  R. A. (1950) Decl.     Delta     r      B
     Dec. 28     1 08.83    + 8 34.6
     Jan.  2     0 34.47    + 5 58.2    0.235   1.011   15.4
           7    23 57.55    + 3 00.4
          12    23 17.93    - 0 17.9    0.222   0.893   15.8
          17    22 36.14    - 3 50.5


SS 433
     S. P. Maran and R. D. Chapman, Goddard Space Flight Center,
report that analysis of the 10-GHz measurements by Seaquist et al.
(1979, A.J. 84, 1037) indicates an apparent variation with a period
of ~ 6.39 days.  This variation may correspond to the visible-light
periodicity reported by Kemp et al. (IAUC 3421).  If so, this
result is consistent with the hypothesis that the high-frequency
radio emission of SS 433 is thermal, although the low-frequency
emission may be nonthermal.


1979 December 21               (3436)              Brian G. Marsden

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