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IAUC 7243: N Cir 1999; SAX J1712.6-3739; 26P

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                                                  Circular No. 7243
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 617-495-7244/7440/7444 (for emergency use only)

     C. Jacques and L. Duczmal, Centro de Estudos Astronomicos de
Minas Gerais, report the following CCD position obtained on Aug.
25.0529 UT with a 0.30-m Schmidt-Cassegrain telescope:  R.A. =
14h23m23s.46, Decl. = -69o08'45".3 (equinox 2000.0; uncertainty +/-
0".4, using 39 stars from the Guide Star Catalogue 1.1).  The star
was at V = 7.64 (comparision star SAO 252717).  G. J. Garradd,
Loomberah, New South Wales, Australia, reports the following
position end figures for N Cir 1999 from a CCD image taken on Aug.
25.3692 with a 0.45-m f/5.4 reflector, when the unfiltered
magnitude was determined to be 7.4:  23s.453, 45".31 (five ACT
stars; rms residuals 0".08).

SAX J1712.6-3739
     J. in 't Zand and J. Heise, Space Research Organization
Netherlands (SRON), Utrecht; A. Bazzano and M. Cocchi, Istituto di
Astrofisica Spaziale, CNR, Rome; and M. J. S. Smith, BeppoSAX
Science Operation Center, Rome, and SRON, communicate:  "During an
observation with Wide Field Camera 2 on BeppoSAX on Aug. 24.2-25.5
UT, an x-ray transient was detected at R.A. = 17h12m34s, Decl. =
-37o38'.6 (equinox 2000.0; 99-percent confidence error radius 3').
The flux decreased from 32 to 20 mCrab (2-9 keV).  No x-ray bursts
were detected.  We designate the source SAX J1712.6-3739.  The
centroid is 0'.6 from the ROSAT all-sky survey source 1RXS
J171237.1-373834, which had a flux of 1.6 mCrab (0.1-2.4 keV)
during the survey."

     S. M. P. McKenna-Lawlor, National University of Ireland at
Maynooth, reports the detection of a possible secondary component
of comet 26P from energetic-particle (about 60-100 keV)
observations by the EPONA instrument aboard the Giotto spacecraft
on 1992 July 10.  The possible secondary component was located 9 x
10**4 km (corresponding to a delay of 40 min along the comet's
orbit) from the primary nucleus and appeared to have had a diameter
3-4 times smaller.  For further details see McKenna-Lawlor and
Afonin (1999, Planet. Space Sci. 47, 557).

                      (C) Copyright 1999 CBAT
1999 August 25                 (7243)            Daniel W. E. Green

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