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IAUC 7120: XTE J1819-254, XTE J1743-363, XTE J1710-281, XTE J1723-376; P/1998 U3

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                                                  Circular No. 7120
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


XTE J1819-254, XTE J1743-363, XTE J1710-281, XTE J1723-376
     C. B. Markwardt, National Research Council and Goddard Space
Flight Center (GSFC); and J. H. Swank and F. E. Marshall, GSFC,
report the detection of two new x-ray transients:  "XTE J1819-254,
whose position is consistent with that of the independently
discovered SAX J1819.3-2525 (cf. IAUC 7119), had fluxes of 20, 37,
3, and 24 mCrab in the band 2-10 keV on Feb. 18.78, 22.65, 25.84,
and Mar. 1.44 UT, respectively, and < 1 mCrab before that time.
XTE J1743-363 has been active since the beginning of Feb. with
intensities ranging from 3 to 15 mCrab.  Variability of as much as
25 percent (r.m.s.) on approximately 1-min timescales has been
seen.  The best-fit position is R.A. = 17h42m58s, Decl. = -36o19'
(equinox 2000.0), with an estimated uncertainty of 10'.  Recent
transients XTE J1710-281 (IAUC 6998) and XTE J1723-376 (IAUC 7103)
remain active, with XTE J1710-281 showing evidence of an
occultation (duration < 800 s).  Semiweekly RXTE monitoring
observations of the Galactic-center region will continue."


COMET P/1998 U3 (JAGER)
     Ephemeris extension to IAUC 7062 (elements MPC 33650):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Mar.  3     6 29.56   +24 10.6   1.521   2.135  114.8   24.9   10.7
     13     6 39.25   +22 13.9   1.619   2.134  107.1   26.4   10.8
     23     6 51.20   +20 25.2   1.725   2.137  100.1   27.3   11.0
Apr.  2     7 04.96   +18 42.0   1.837   2.145   93.6   27.7   11.1
     12     7 20.10   +17 02.0   1.953   2.157   87.5   27.7   11.3
     22     7 36.29   +15 22.9   2.073   2.172   81.9   27.3   11.5
May   2     7 53.23   +13 43.1   2.194   2.192   76.6   26.6   11.6
     12     8 10.69   +12 01.2   2.317   2.215   71.5   25.6   11.8
     22     8 28.48   +10 16.6   2.441   2.242   66.7   24.5   11.9
June  1     8 46.45   + 8 28.7   2.564   2.272   62.0   23.2   12.1
     11     9 04.47   + 6 37.5   2.687   2.305   57.4   21.8   12.3
     21     9 22.48   + 4 42.9   2.809   2.341   53.0   20.3   12.4
July  1     9 40.38   + 2 45.4   2.928   2.380   48.5   18.7   12.6
     11     9 58.14   + 0 45.3   3.045   2.422   44.2   17.0   12.8
     21    10 15.73   - 1 17.0   3.158   2.465   39.8   15.3   12.9
     31    10 33.13   - 3 20.8   3.267   2.511   35.5   13.6   13.1
Aug. 10    10 50.32   - 5 25.6   3.371   2.559   31.2   11.9   13.2

                      (C) Copyright 1999 CBAT
1999 March 3                   (7120)            Daniel W. E. Green

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