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IAUC 3314: 1978r; X-RAY EMISSION FROM SS 433; Occn OF SAO 114159 BY (18); WZ Sge

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IAUC number

                                                  Circular No. 3314
Central Bureau for Astronomical Telegrams
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

     Y. Kozai, Tokyo Astronomical Observatory, telexes that this
comet has been recovered by T. Seki, Geisei, as follows:

     1978 UT             R. A. (1950) Decl.        m1
     Nov.  8.83715    12 24 15.0    - 2 09 15     17
     Dec. 11.84583    14 36 51.9    -11 25 24     15
          11.85799    14 36 54.9    -11 25 39

The Nov. 8 observation is a single exposure with the comet's image
overlapping that of a magnitude 16 star.  On Dec. 11 the comet was
large, very faint but distinct, diffuse with condensation and a
possible short tail.  The prediction on IAUC 3249 requires correction
by Delta-T = +0.10 day.

     F. E. Marshall, R. F. Mushotzky, E. A. Boldt, S. S. Holt and
P. J. Serlemitsos, Goddard Space Flight Center, report: "X-rays
have been detected using the HEAO-A2 experiment from a variable
source H 1908+050 tentatively identified with SS 433, which was recently
found to be a variable radio source (IAUC 3256), and which
lies at the edge of the 0.1-square-degree HEAO-A2 90-percent-confidence
error box.  The average 2-10-keV intensity during observations
from Apr. 7 to 13 was 1.2 +/- 0.1 x 10**-10 erg cm**-2 s**-1, assuming
a power-law spectrum of photon index 1.5.  There is some evidence
for variability on timescales less than a day.  Observations
six months earlier found only half this intensity.  SS 433 may also
be the correct identification for 4U 1908+05 and A 1909+04."

     D. W. Dunham, Silver Spring, Maryland, informs us that successful
photoelectric observations of this event (cf. IAUC 3312) were
made by three teams in Washington, DC, and north of Baltimore, MD.

     Visual magnitude estimates: Nov. 28.99 UT, [14.5 (J. Bortle,
Brooks Obs.); Dec. 7.02, 8.9 (R. Anail, Columbia, SC); 9.03, 8.9
(Anail); 10.19, 9.4 (P. Collins, Tucson, AZ); 11.00, 9.7 (Bortle).

1978 December 13               (3314)              Brian G. Marsden

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