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IAUC 2995: EMISSION Var IN Sge; CYGNUS X-1; GALACTIC PLANE STUDY BY ARIEL 5; R CrB Vars; V1500 Cyg

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IAUC number 

                                                  Circular No. 2995
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


EMISSION VARIABLE IN SAGITTA
     E. P. Aksenov, Sternberg Astronomical Institute, reports that
an emission variable has been discovered by Dokuchaeva, Balazs and
Vizi at R.A = 19h39m.8, Decl. = +16o38' (equinox 1950.0).  An observation
by O. D. Dokuchaeva on July 2.90 UT put the object at photographic
magnitude 11.0.  Before Apr. 1975 the magnitude was about 17.  The
object is similar to V1016 and V1329 Cyg.


CYGNUS X-1
     M. Oda and C. Canizares, Massachusetts Institute of Technology,
report that SAS-3 observations that began on Oct. 9 show Cyg X-1 to
be in a condition of extreme and unusual variability.  This condition
was still present as of Oct. 13.5 UT.  The source exhibits continual,
rapid flaring by factors of 2-4 on timescales of a few seconds.
The mean intensity corresponds to that of the 'low state'.


GALACTIC PLANE STUDY BY ARIEL 5
     M. Watson and K. Pounds inform us that the Ariel 5 Sky Survey
Instrument will be scanning the galactic plane from Nov. 12 to Dec.
2.  It will be possible for the time variability of the brighter
galactic x-ray sources to be monitored continuously.  Those interested
in making joint observations during this period are invited
to contact M. Watson at the address: X-Ray Astronomy Group, Physics
Department, University of Leicester, Leicester LE1 7RH, England.


R CrB VARIABLES
     SU Tau and U Aqr have recently exhibited declines in brightness.
Visual magnitude estimates by R. Lukas, Wilhelm Foerster
Observatory, and by J. Bortle, Brooks Observatory, respectively:

SU Tau.  Aug. 17.85 UT, 14.0; 19.88, 14.2.
U Aqr.  Aug. 31.1 UT, 11.9; Sept. 14.1, 12.7; 20.0, 13.2; 22.1,
   14.0; 24.1, 14.3.


V1500 CYGNI
     Visual magnitude estimates by S. O'Meara, Harvard Observatory:
Sept. 7.1 UT, 11.3; 20.0, 11.6; Oct. 3.1, 11.7; 14.1, 11.6.


1976 October 18                (2995)              Brian G. Marsden

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