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IAUC 6957: 1998cs; 1998ct; XTE J2123-058

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                                                 Circular No. 6957
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)


SUPERNOVA 1998cs IN UGC 10432
     T. Puckett, Mountain Town, GA, reports his discovery of an
apparent supernova (mag 17.5) on an unfiltered CCD frame taken with
the Puckett Observatory 0.30-m automated supernova patrol telescope
on June 29.25 UT.  The candidate is located at R.A. = 16h30m39s.22,
Decl. = +41o12'54".4 (equinox 2000.0), which is 0".2 east and 16".0
north of the nucleus of UGC 10432.  SN 1998cs was also present on
CCD frames taken on June 30.14 at mag 17.0.  The object was not
present on previous CCD frames taken on June 2.17 (limiting mag
18.75).  The object does not appear on the Palomar Sky Survey scans.


SUPERNOVA 1998ct IN UGC 10062
     M. Schwartz, Cottage Grove, OR, reports his discovery of an
apparent supernova (mag 16.1) on an unfiltered CCD frame taken with
the 0.35-m Tenagra I automated supernova patrol telescope on June
29.30 UT.  The candidate is located at R.A. = 15h51m11s.67, Decl. =
+21 56'36".0 (equinox 2000.0), which is 5" west and 2" north of the
center of UGC 10062.  The object is also present with unchanged
position on a frame taken on June 30.26.  The limiting magnitude of
the exposures was about 19.  SN 1998ct does not appear on either
the first or the second Palomar Sky Survey scans, and it is also
absent from the USNO A1.0 catalogue.


XTE J2123-058
     J. A. Tomsick, J. P. Halpern, and K. M. Leighly, Columbia
University; and E. Perlman, Space Telescope Science Institute,
report the identification of the optical counterpart within the ASM
(cf. IAUC 6955) and PCA error regions, based on photometry with the
MDM Observatory 1.3-m telescope beginning on June 30.31 UT:  "The
star is at R.A. = 21h23m14s.54, Decl. = -5o47'52".9 (equinox 2000.0;
position uncertainty 1".0).  Magnitudes measured on June 30.44 are
U = 16.40, B = 17.28, V = 17.30, R = 17.24, I = 17.22, with
preliminary errors of 0.05 mag.  This star is only marginally
visible on a digitized U.K. Schmidt plate.  A low-resolution
spectrum obtained on the Kitt Peak 2.1-m telescope shows weak
absorption lines of H-beta (equivalent width 0.12 nm), H-gamma (EW
= 0.41 nm), and He I 447-nm (EW = 0.4 nm).  He II 468-nm emission
of EW = 0.40 nm is also seen.  These properties are typical of
x-ray transients in outburst."

                      (C) Copyright 1998 CBAT
1998 June 30                   (6957)            Daniel W. E. Green

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