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IAUC 8100: XTE J1550-564; eta Car; C/2002 W1, C/2002 W2, C/2002 W3, C/2002 W4

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                                                  Circular No. 8100
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
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XTE J1550-564
     P. Dubath, INTEGRAL Science Data Center and Geneva Observatory;
M. Revnivtsev, Space Research Institute, Moscow, and Max-Planck-
Institut fuer Astrophysik, Garching; P. Goldoni, Centre d'Etude
Atomique and Service d'Astrophysique, Saclay; A. von Kienlin, Max-
Planck-Institut fuer Extraterrestrische Physik; N. Lund, Danish
Space Research Institute, Copenhagen; S. Grebenev, Space Research
Institute, Moscow; and E. Kuulkers, Research and Science Support
Department, ESTEC, Noordwijk, report a new x-ray outburst of the
transient source XTE J1550-564 (cf. IAUC 7010), detected with the
IBIS and SPI instruments onboard the INTEGRAL satellite.  Between
Mar. 24.2 and 25.1 UT, the average fluxes were about 150 mCrab in
the energy band 15-40 keV and about 250 mCrab in the band 40-100
keV.  The photon index of the spectrum is about 1.5 in the energy
band 20-150 keV.  Observations at other wavelengths are encouraged.

     R. S. Levenhagen, A. Damineli, N. V. Leister, and Z. Abraham,
Universidade de Sao Paulo and the State of Sao Paulo Research
Foundation, report on spectroscopy of eta Car made on Mar. 15.2 UT
at Laboratorio Nacional de Astrofisica.  The 'red' peak in the He I
line at 1083 nm, which was stronger than the 'violet' peak during
the last five years, is now fainter and decreasing rapidly.  This
is a clear sign that the 'spectroscopic event' predicted for late
June 2003 is under way (Damineli et al. 2000, Ap.J. 528, L101);
based on this single observation, a lower limit of 2005 days is
derived for the periodicity of such events.

COMETS C/2002 W1, C/2002 W2, C/2002 W3, C/2002 W4 (SOHO)
     Further to IAUC 8099, D. Hammer reports measurements for
additional Kreutz sungrazing comets found on SOHO C2 website images
by X.-M. Zhou (C/2002 W1), R. Kracht (C/2002 W2, C/2002 W3), and M.
Meyer (C/2002 W4).  The reduced astrometry and orbital elements by
B. G. Marsden appear on the MPECs cited below.

  Comet         2002 UT          R.A. (2000) Decl.       MPEC
  C/2002 W1     Nov. 16.642      15 27.6   -20 36       2003-F16
  C/2002 W2          17.775      15 30.7   -20 43       2003-F16
  C/2002 W3          18.742      15 33.8   -20 52       2003-F18
  C/2002 W4          19.535      15 37.0   -21 02       2003-F18

                      (C) Copyright 2003 CBAT
2003 March 25                  (8100)            Daniel W. E. Green

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