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IAUC 6983: 1998di; 2S 1711-339; C/1998 J1; 21P

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                                                 Circular No. 6983
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)


1998di
     S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, communicate:  "A spectrum of
SN 1998di (cf. IAUC 6982) taken by P. Berlind on Aug. 4.4 UT at the
Whipple Observatory 1.5-m telescope (+ FAST spectrograph) exhibits
a blue continuum with shallow absorption troughs shortward of 500
nm.  The object appears 4" east and 4" north of an anonymous galaxy
with a recession velocity of 10 750 +/- 30 km/s.  The shallow
absorption features have widths of about 3000 km/s (FWHM) and
correspond to He I absorption at zero radial velocity.  The
spectrum resembles that of CR Boo, a hydrogen-deficient dwarf nova,
near maximum (Patterson et al. 1997, PASP 109, 1100).  We conclude
that 1998di is not a supernova, but rather is a Galactic dwarf nova
discovered in outburst that is simply situated nearly in front of
the distant galaxy."


2S 1711-339
     R. Remillard reports for the RXTE ASM team at Massachusetts
Institute of Technology and Goddard Space Flight Center, NASA: "The
RXTE All-Sky Monitor has detected x-ray emission at a position
consistent with the recurrent transient 2S 1711-339 (e.g.,
Greenhill et al. 1979, Nature 279, 620).  The ASM error circle (4'
radius) is centered 1' north of the more accurate SAS position at
R.A. = 17h14m19s, Decl. = -34o02'.9 (equinox 2000.0).
Retrospective analysis indicates that the x-ray flux (2-12 keV)
began to increase on July 21, reaching 25 +/- 4 mCrab on July 22
and 54 +/- 5 mCrab on July 27.  Thereafter, the ASM results are
consistent with a slow decline to 33 +/- 6 mCrab on Aug. 4.  Radio
and optical observations are needed."


COMET C/1998 J1 (SOHO)
     Visual m_1 estimates:  July 3.30 UT, 8.0 (S. T. Rae, Te
Awamutu, New Zealand, 10x50 binoculars); 22.39, 9.3 (D. A. J.
Seargent, Cowra, N.S.W., 15x80 binoculars); 23.42, 9.4 (Seargent).


COMET 21P/GIACOBINI-ZINNER
     Visual m_1 estimates:  May 31.93 UT, 14.9 (M. Lehky, Hradec
Kralove, Czech Republic, 0.42-m reflector); June 25.99, 14.3 (K.
Sarneczky, Agasvar, Hungary, 0.44-m reflector); July 22.96, 13.8
(R. J. Bouma, Lattrop, The Netherlands, 0.40-m reflector); Aug.
1.97, 13.1 (M. Reszelski, Pamiatkowo, Poland, 0.25-m reflector).

                      (C) Copyright 1998 CBAT
1998 August 5                  (6983)            Daniel W. E. Green

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