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IAUC 7013: XTE J1550-564; 88P; P/1998 QP_54

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                                                 Circular No. 7013
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, 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)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


XTE J1550-564
     F. E. Marshall, Goddard Space Flight Center; D. A. Smith,
Massachusetts Institute of Technology; and T. Dotani and Y. Ueda,
Institute of Space and Astronautical Science, on behalf of the ASCA
team, report:  "Using an ASCA observation on Sept. 12, we find an
improved x-ray position for this transient (IAUC 7008) of R.A. =
15h50m59s, Decl. = -56o29'.2 (equinox 2000.0) with an estimated
uncertainty of 0'.6 (90-percent confidence).  This position is
consistent with the positions of the possible optical and radio
counterparts reported on IAUC 7009 and 7010.  The average 2-10-keV
flux was about 2.3 x 10E-8 ergs sE-1 cmE-2."
     A. J. Castro-Tirado, Instituto de Astrofisica de Andalucia,
Granada, and Laboratorio de Astrofisica Espacial y Fisica
Fundamental, Madrid; H. W. Duerbeck, University of Muenster; I.
Hook, European Southern Observatory (ESO), Garching; and L. Yan,
Carnegie Observatories, Pasadena, report: "A 300-s optical spectrum
(range 350-740 nm, resolution 2.0 nm) obtained with the 3.6-m
telescope (+ EFOSC2) at ESO, La Silla, on Sept. 15.98 UT, of the
proposed optical counterpart (IAUC 7009) shows a strong and broad
emission line arising from H-alpha (656.3 nm, FWHM = 1250 km/s,
equivalent width = 1.2 nm), as well as broad and weaker emission
lines from H-beta (486.1 nm, FWHM = 1650 km/s, EW = 0.4 nm) and He
II (468.6 nm, FWHM = 1500 km/s, EW = 0.4 nm).  N III (464.0 nm) is
also marginally detected.  These lines are typical of soft x-ray
transients in outburst.  The emission lines and several
interstellar absorption lines are superposed on a red continuum.
From observations carried out with the Dutch 0.91-m telescope at La
Silla in the Bessel V and Gunn i filters, we obtain V = 16.7 +/-
0.1, V-i = +1.80 (Sept. 16.0).  Additional spectroscopy and
photometry during the outburst would be highly valuable."


COMET 88P/HOWELL
     Visual m_1 estimates:  Aug. 10.43 UT, 11.7 (M. Mattiazzo,
Wallaroo, S. Australia, 0.20-m reflector); 22.88, 10.8 (J. Carvajal,
Avila, Spain, 0.32-m reflector); Sept. 10.45, 10.8 (Mattiazzo);
13.44, 10.2 (D. A. J. Seargent, The Entrance, N.S.W., 25x100
binoculars); 15.41, 10.4 (Seargent).


COMET P/1998 QP_54
   Corrigendum.  On IAUC 7012, line 14, for  135 deg  read  225 deg

                      (C) Copyright 1998 CBAT
1998 September 16              (7013)            Daniel W. E. Green

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