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IAUC 3639: SS Cyg; 1981 QA; 1981 QB

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IAUC number 

                                                  Circular No. 3639
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


SS CYGNI
     A. J. Bennetts, M. J. Ricketts and M. A. Barstow, Leicester
University; and C. V. Goodall, Birmingham University, inform us
that the satellite Ariel 6 will be observing SS Cyg from about
Sept. 23 to Oct. 18, covering an energy range from 0.2 to 15 keV.
A Leicester-M.I.T. rocket-borne instrument (energy range 0.05-0.25
keV) is also due to observe the star on Oct. 16.  Optical observations
during this period will be most welcome.  For further details
contact Ricketts at telex (U.K.) 341664 LUXRAY G or telephone (U.K.)
0533-554455.


1981 QA
     This ephemeris continuation is from the elements to be
published in the Oct. 1 batch of MPCs.  The magnitudes given on IAUC
3634 require correction by -2.0.  It has been reported that this
object has the unusual1y long rotation period of ~ 6 days.

     1981 ET     R. A. (1950) Decl.     Delta     r     Mag.
     Sept.23    22 08.18    -12 49.1    0.255   1.230   15.0
          28    22 24.72    -14 10.6
     Oct.  3    22 40.17    -15 05.9    0.301   1.261   15.5
           8    22 54.52    -15 37.7
          13    23 07.82    -15 49.1    0.360   1.299   16.0
          18    23 20.17    -15 43.4
          23    23 31.67    -15 23.6    0.431   1.343   16.5


1981 QB
     This ephemeris continuation is also from the elements to be
published in the Oct. 1 batch of MPCs.

     1981 ET     R. A. (1950) Decl.     Delta     r     Mag.
     Sept.23    21 12.90    -48 58.6    0.390   1.244   16.5
          28    21 10.81    -55 12.2
     Oct.  3    21 10.86    -60 27.3    0.441   1.192   16.9
           8    21 13.62    -64 51.3
          13    21 19.74    -68 32.9    0.501   1.148   17.2
          18    21 30.0     -71 39.3
          23    21 45.3     -74 15.7    0.558   1.113   17.4


1981 September 23              (3639)              Brian G. Marsden

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