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IAUC 7582: SAX J1711.6-3808; C/2001 C3, C/2001 C4; C/1999 T1

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                                                  Circular No. 7582
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
Phone 617-495-7440/7244/7444 (for emergency use only)

SAX J1711.6-3808
     J. J. M. in 't Zand, Astronomical Institute, Utrecht
University, and Space Research Organization Netherlands (SRON),
Utrecht; R. G. Kaptein, BeppoSAX Science Operation Center, Rome,
and SRON; and J. Heise, SRON, communicate:  "During an observation
with Wide Field Camera unit 1 aboard BeppoSAX on Feb. 8.8-11.5 UT,
an x-ray transient was detected at R.A. = 17h11m36s, Decl. =
-38o08'.5 (equinox 2000.0; 99-percent confidence error radius
1'.2).  The flux varied between 30 and 80 mCrab (2-9 keV) in hourly
integrations.  No x-ray bursts were detected.  We designate the
source SAX J1711.6-3808.  Follow-up observations are encouraged."

COMETS C/2001 C3 AND C/2001 C4 (SOHO)
     Further to IAUC 7573 and 7580, D. Hammer reports his
measurements for additional Kreutz sungrazing comets found by M.
Oates on SOHO website images.  Both objects were visible in the C2
coronagraph, but only C/2001 C3 (which also developed a long, thin
tail but faded rapidly as it entered the C2 field-of-view on Feb.
4.8 UT) was also visible in C3 data.  The reduced observations and
orbital elements by B. G. Marsden are included on MPEC 2001-C23.

    Comet         2001 UT           R.A. (2000) Decl.
    C/2001 C3     Feb.  3.488      21 38.9   -19 17
    C/2001 C4           8.204      21 35.4   -16 01

     D. K. Lynch, R. W. Russell, and D. Kim, The Aerospace
Corporation; and M. L. Sitko and S. Brafford, University of
Cincinnati, report 3- to 14-micron spectroscopy of this comet on
Jan. 31.62 and Feb. 1.7 UT using BASS at the Infrared Telescope
Facility:  "The spectrum on the first night showed a silicate
emission feature extending about 12 percent above the continuum
defined by a blackbody fitted to the 8- and 13-micron points.  Two
prominent emission features at 10.3 and 11.2 microns appeared above
the silicate band, the latter seemingly indicative of crystalline
olivine.  The 8- to 13-micron color temperature was 260 +/- 10 K,
about 10 percent above the blackbody radiative equilibrium
temperature of 235 K.  The magnitude at 10.5 microns was [N] = 3.0
+/- 0.1.  On the second night, the two prominent emission features
were absent, although the silicate emission feature maintained its
trapezoidal shape with breaks at 9.5 and 11.1 microns."

                      (C) Copyright 2001 CBAT
2001 February 13               (7582)            Daniel W. E. Green

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