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IAUC 7260: 1999 S2; DO Dra; V4444 Sgr

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                                                  Circular No. 7260
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)


COMET 1999 S2
     R. H. McNaught, Australian National University, reports his
discovery of a comet on an R survey film taken with the U.K.
Schmidt Telescope by F. G. Watson.  The comet shows a very strong
central condensation, a weak circular coma of diameter 20", and a
diffuse tail 3'.5 long in p.a. 210 deg.  Confirming CCD images by
McNaught with the 1.0-m f/8 reflector at Siding Spring on Sept. 21
yield m_2 = 20.1-20.2.

     1999 UT             R.A. (2000) Decl.        m1    Observer
     Sept.19.72016    3 13 21.68   -63 48 28.8   17.5   Watson
          19.76183    3 13 20.56   -63 48 33.5            "
          21.55226    3 12 26.29   -63 53 46.0          McNaught
          21.55392    3 12 26.24   -63 53 46.2            "
          21.55595    3 12 26.16   -63 53 46.6            "
          21.55789    3 12 26.09   -63 53 46.9            "


DO DRACONIS
     This variable is in outburst for the first time since mid-Oct.
1996 (cf. IAUC 6493), when it reached m_v = 10.4, according to
J. A. Mattei, AAVSO.  The following visual magnitude estimates were
forwarded by E. O. Waagen, AAVSO:  Sept. 18.81 UT, [13.5 (P.
Schmeer, Bischmisheim, Germany); 20.830, 11.2 (E. Muyllaert,
Oostende, Belgium); 20.904, 11.0 (M. Westlund, Uppsala, Sweden);
21.142, 10.7 (Schmeer).


V4444 SAGITTARII
     D. K. Lynch, R. J. Rudy, S. Mazuk, The Aerospace Corporation;
and R. C. Puetter, Center for Astrophysics and Space Science,
University of California at San Diego, report 0.8-2.5-micron
spectrophotometry of V4444 Sgr = N Sgr 1999 using the Shane 3-m
telescope (+ Aerospace Near Infrared Imaging Spectrograph) at Lick
Observatory on Aug. 31.19 UT (about 120 days after outburst).  The
spectrum shows many emission lines (FWHM about 2000 km/s) with the
strongest being He I 1.0830-microns, followed by the Paschen and
Brackett lines.  Also present were the Lyman-beta fluoresced O I
lines at 0.8446 and 1.1287 microns and the [Si VI] coronal line at
1.9629 microns.  The spectrum also showed a continuum rising
smoothly to the red between 1.5 and 2.4 microns.  This could
indicate thermal emission from a dust shell or the effects of
strong interstellar reddening.  J, H, and K magnitudes were 12.4,
12.0, and 10.0, respectively.

                      (C) Copyright 1999 CBAT
1999 September 21              (7260)            Daniel W. E. Green

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