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IAUC 6091: 1994r; KS 1730-312; 1994g; 1994j

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IAUC number

                                                  Circular No. 6091
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM

     Donald E. Machholz, reports his visual discovery of a comet.
The following observations are available:

     1994 UT             R.A. (2000) Decl.        m1    Observer
     Oct.  8.505      8 42.0       +55 23        11.5   Machholz
           8.81957    8 41 44.72   +55 25 29.2   16.5   Ticha
           8.82142    8 41 44.63   +55 25 29.6            "
           8.82392    8 41 44.46   +55 25 30.2            "

D. E. Machholz (Colfax, CA).  0.25-m f/3.8 reflector, 36 x.  Comet
   diffuse with weak condensation.
J. Ticha and M. Tichy (Klet Observatory).  0.57-m f/5.2 reflector + CCD
   + R filter.  Measurer M. Tichy.  Object slightly diffuse.

KS 1730-312
     M. Gilfanov, E. Churazov, J. Ballet and E. Jourdain, on behalf of
Granat team, report: "In the course of observations of the Galactic
Center region on Sept. 26-27 Granat/SIGMA marginally detected KS 1730-312
(cf. IAUC 6083) with a 40-150-keV flux of 40 +/- 15 mCrab.  During
subsequent observations on Sept. 28-30 the hard x-ray emission from the
source was below SIGMA sensitivity (2 sigma limit 30 mCrab).  The fast
increase of the flux in the standard x-ray band observed by TTM
(cf. IAUC 6088) was thus accompanied by a decrease of the hard x-ray flux,
this behavior being consistent with dramatic steepening of the
broad-band source spectrum observed by both TTM and SIGMA."

     Total visual magnitude estimates: Aug. 7.39 UT, 13.1 (A. Hale,
near Chaparral, NM, 0.41-m reflector); 14.45, 13.2 (Hale); Sept. 7.03,
14.1 (K. Sarneczky, Raktanya, Hungary, 0.44-m reflector); 9.42, 12.9 (Hale).

     Total visual magnitude estimates by Hale: Aug. 14.46 UT, 13.8;
Sept. 9.40, 13.9; 16.44, 13.8.

1994 October 8                 (6091)              Brian G. Marsden

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