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IAUC 6435: GRS 1915+105; C/1996 N1

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                                                  Circular No. 6435
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


GRS 1915+105
     B. Thomas, Hughes STX and NASA Goddard Space Flight Center
(GSFC); R. Corbet, Universities Space Research Association and
GSFC; J. Swank, GSFC; W. Focke, University of Maryland and GSFC;
and F. Marshall, GSFC, report:  "Observations made of GRS 1915+105
on July 11.357-11.397 UT with the RXTE PCA show the presence of
strong x-ray (1-12 keV) quasi-periodic oscillations (QPOs) at 2.64
Hz (rms amplitude 9.2 +/- 0.3 percent, Lorentzian width 0.25 Hz)
with a weaker feature at 5.27 Hz (3.3 +/- 0.4 percent, width 2 Hz).
We note that the previously observed QPO between 0.5 and 100 mHz
and at 67 Hz (IAUC 6392) were not apparent in this observation.
This change in properties may be related to the recent radio
outburst from this source (IAUC 6432).  The flux during this
observation was about 700 mCrab and the variability < 10 percent
during the observation interval."


COMET C/1996 N1 (BREWINGTON)
     Improved ephemeris from orbital elements on MPEC 1996-N02:

1996 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July  6    11 38.78   + 5 49.3   0.833   1.053   68.6   64.0    9.8
     11    11 53.46   +10 38.6   0.837   1.015   65.5   65.8    9.7
     16    12 08.40   +15 21.1   0.845   0.982   62.9   67.1    9.6
     21    12 23.50   +19 54.8   0.855   0.956   60.7   68.0    9.5
     26    12 38.72   +24 17.8   0.867   0.938   59.1   68.3    9.4
     31    12 54.03   +28 28.4   0.881   0.928   58.1   68.2    9.4
Aug.  5    13 09.49   +32 25.6   0.895   0.926   57.6   67.7    9.4
     10    13 25.21   +36 08.4   0.908   0.933   57.8   66.8    9.5
     15    13 41.39   +39 36.4   0.921   0.948   58.5   65.6    9.6
     20    13 58.30   +42 49.5   0.933   0.972   59.8   64.1    9.7
     25    14 16.28   +45 47.8   0.944   1.002   61.6   62.5    9.9
     30    14 35.71   +48 31.1   0.953   1.038   63.8   60.8   10.1
Sept. 4    14 57.04   +50 58.8   0.960   1.080   66.5   58.9   10.2

      Visual m1 and coma-diameter estimates:  July 10.91 UT, 9.7,
-- (A. Pereira, Cabo da Roca, Portugal, 0.25-m reflector); 12.09,
9.4, 2'.5 (J. E. Bortle, Stormville, NY, 0.41-m reflector); 12.85,
8.8, 8' (A. Baransky, Kiev, Ukraine, 20x110 binoculars); 14.22,
9.0, 8'.5 (C. S. Morris, Lockwood Valley, CA, 20x80 binoculars).

                      (C) Copyright 1996 CBAT
1996 July 15                   (6435)            Daniel W. E. Green

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