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IAUC 7426: C/2000 J4; CI Aql; V4334 Sgr

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                                                  Circular No. 7426
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)

COMET C/2000 J4 (SOHO)
    D. A. Biesecker, Emergent Information Technologies, Inc., and
Goddard Space Flight Center, reports observations of another Kreutz
sungrazing comet found by M. Oates and X. Leprette in LASCO C2 data
at the SOHO website.  The comet is also visible in C3 data, and a
very short tail is visible.  Astrometry (measured by D. Hammer and
Biesecker, reduced by B. G. Marsden) and orbital elements appear on
MPEC 2000-K08.

     2000 UT           R.A. (2000) Decl.
     May 14.904       3 32.9       +16.58

     J. C. Wilson, Cornell University; and K. R. Dunscombe, Palomar
Observatory, report 0.75-2.5-micron spectroscopy of the probable
nova in Aquila (IAUC 7409) using the Palomar 1.52-m telescope (+
Cornell/Massachusetts Slit Spectrograph) on May 9.493 UT (about 11
days after outburst):  "Spectra were taken of the infrared-bright
object found at R.A. = 18h52m04s.0, Decl. = -1 28'40" (equinox
2000.0), which correlates roughly with the suspected 1917 nova and
eclipsing binary CI Aql.  The spectrum shows nearly 30 emission
lines, including Paschen- and Brackett-series hydrogen lines as
well as many N I and O I features.  He I (1.0830 microns) is
self-absorbed.  Hydrogen line ratios differ profoundly from the
recombination values.  Lyman-beta fluoresced O I lines (0.8446 and
1.1287 microns) are very strong.  The K magnitude is estimated to
be 7-8."
     M. O. Jesacher, S. J. Kautsch, S. Kimeswenger, M. S.
Muhlbacher, W. Saurer, S. Schmeja, and C. K. Scholz, University of
Innsbruck, report BVR CCD magnitudes (+/- 0.05 mag) obtained with
the Innsbruck 0.60-m telescope on May 10.97 UT and infrared
magnitudes obtained with the European Southern Observatory 1-m
telescope (+ DENIS) on May 11.38:  B = 10.49, V = 9.67, R = 8.48,
I_c = 8.28, J = 6.35, K_s = 6.12.

     Kimeswenger and Schmeja also report infrared-imaging
photometry of V4334 Sgr on May 6.292 UT at the European Southern
Observatory 1-m telescope (+ DENIS):  "The K flux has increased
compared to recent reports (IAUC 7266, 7422), while the star faded
in J and vanished in I (K = 7.03, J = 14.22, I > 19.1).  Such a
behavior cannot be described by cooling of the dust, but implies a
strong further increase of the internal extinction."

                      (C) Copyright 2000 CBAT
2000 May 19                    (7426)            Daniel W. E. Green

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