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IAUC 3852: 1983l; Her X-1 AND MXB 1730-335

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IAUC number 

                                                  Circular No. 3852
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


COMET CERNIS (1983l)
     The following precise positions have been reported:

    1983 UT           R.A.    (1950.0)    Decl.    Observer

    Aug.  5.67326     2 39 15.81    + 7 45 57.2    Furuyama
          5.68819     2 39 15.50    + 7 45 44.7      "
          7.98735     2 38 15.70    + 7 08 39.9    Majsuradze
          9.98056     2 37 17.44    + 6 35 14.7      "
         10.00625     2 37 16.65    + 6 34 48.6      "

S. Furuyama (JCPM Tone Station).  0.25-m Wright-Schmidt telescope.
   Measurer: N. Ishiyama.  From Japan Astron. Circ. No. 386.
Majsuradze (Abastumani Obs.).  Communicated by Yu. V. Batrakov.

     Parabolic elements from 15 observations July 21-Aug. 10:

         T = 1983 July 19.7232 ET  Peri. = 185.8692
                                   Node  = 208.8757   1950.0
         q =   3.317524 AU         Incl. = 134.6630

     Visual estimates of total magnitude and coma diameter by J.
Bortle, Stormville, NY: Aug. 3.33 UT, 10.6, 0'8 (0.32-m reflector,
bright moonlight); 10.34, 10.2, 2'0 (0.32-m reflector); 14.33,
10.0, 2' (20 x 80 binoculars); 16.32, 9.9, 4' (20 x 80 binoculars).


HERCULES X-1 AND MXB 1730-335
     On behalf of the Tenma Team, Y. Tanaka reports: "With reference
to the EXOSAT reports on IAUC 3841, Tenma observed on and off
states of Her X-1 during May 20-June 1.  When the object entered
the field of the detectors on May 20 the intensity was already ~
50 Uhuru units, a typical high-state intensity indicating that
actual turn-on had occurred several days before.  Pulsations and
orbital Doppler effect were clearly seen until May 27.  After May
28 the intensity dropped below ~ 3 Uhuru units and faded away."

     He also reports that the Rapid Burster MXB 1730-335 may have
become active.  Its persistent flux became visible to Tenma on
Aug. 5 and increased to ~ 0.1 Crab (2-10 keV).  Bursts, which are
apparently of type 1 (Hoffman et al. 1978, Nature 271, 630) are
being observed to occur about once every 70 min.  No type 2 rapid
bursts are yet seen.  He adds that both Tenma and Hakucho are
currently observing the source and urges that infrared and radio
observers monitor this source.


1983 August 17                 (3852)              Brian G. Marsden

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