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IAUC 6455: 1996 Q1; GRS 1915+105

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                                                  Circular No. 6455
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)


COMET 1996 Q1
     Vello Tabur, Wanniassa, Australian Capital Territory, reports
his discovery of a comet.  The following observations are available:

     1996 UT             R.A. (2000) Decl.        m1    Observer
     Aug. 19.6951     4 44 30      - 9 23.2      10     Tabur
          19.8000     4 44 42      - 9 22.4               "
          20.7361     4 46 12      - 9 02.9               "
          21.10556    4 46 44.91   - 8 55 52.2   11.1   Mikuz
          21.11506    4 46 45.85   - 8 55 41.1            "
          21.12133    4 46 46.38   - 8 55 36.9            "
          21.12574    4 46 46.78   - 8 55 28.3            "
          21.45       4 47.5       - 8 49        10.0   Hale

V. Tabur (Wanniassa, A.C.T.).  0.20-m f/4.7 reflector.  Circular
  coma of diameter 3' with little or no condensation.
H. Mikuz (Crni Vrh Observatory).  0.20-m f/2 Baker-Schmidt telescope
  + CCD + V filter.  Coma diameter 4'.5, moderately condensed.
A. Hale (Cloudcroft, NM).  0.41-m reflector (visual).  Coma
  diameter 3'.5.


GRS 1915+105
     B. Sams and A. Eckart, Max-Planck-Institut fur
Extraterrestrische Physik; and R. Sunyaev, Max-Planck-Institut fur
Astrophysik, report the disappearance of the near-infrared jets
observed in GRS 1915+105 in July 1995 (Sams et al. 1996, Nature 382,
47):  "Using the same observing equipment as in July 1995 (ESO New
Technology Telescope + SHARP speckle camera), new observations on
June 7 show no evidence of any asymmetry in the image of the object
down to a 3-sigma level of (magnitude) K = 16.5 +/- 0.3.  This is a
factor of eleven times fainter than the previously observed
southwest jet.  Hence the lifetime of the infrared jet is < 1 yr.
We detected the brightest total infrared emission yet observed from
GRS 1915+105, with J = 16.3 +/- 0.1, H = 14.0 +/- 0.1, and K = 12.3
+/- 0.1.  Fluxes were calibrated against kappa Aql (HR 7446), which
was assumed to have J = 5.03, H = 5.06, and K = 5.07.  Comparison
with previous observations (IAUC 6267; Mirabel et al. 1995, A.Ap.
282, L17) shows that the infrared emission from GRS 1915+105
becomes bluer as the K-band emission increases.  This behavior is
typical of systems with x-ray heating of the normal star and outer
zones of the accretion disk."

                      (C) Copyright 1996 CBAT
1996 August 21                 (6455)            Daniel W. E. Green

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