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IAUC 7449: 2000ct; C/1999 S4

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                                                  Circular No. 7449
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)


SUPERNOVA 2000ct IN ANONYMOUS GALAXY
     S. Jha, P. Challis and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics, report that a spectrum of SN 2000ct, obtained by
A. Mahdavi on July 7.24 UT with the F. L. Whipple Observatory 1.5-m telescope
(+ FAST spectrograph), shows it to be a type IIn supernova at an early
epoch.  The spectrum exhibits a very blue continuum, with strong Balmer
emission lines as well as weak He I (rest 587.6 nm) emission.  The
Balmer lines consist of a narrow component (FWHM = 1000 km/s) on top
of a broader base (FWHM = 3000 km/s).  Cross-correlation of the host
galaxy spectrum with an emission-line template yields a recession
velocity of 8950 +/- 30 km/s.


COMET C/1999 S4 (LINEAR)
     Recent binocular magnitude estimates: June 28.94 UT, 8.5 (A. Baransky,
Kiev, Ukraine, 12 x 80); 30.99, 8.3 (R. J. Bouma, Groningen, The Netherlands,
15 x 80); July 2.91, 7.7 (M. Reszelski, Szamotuly, Poland, 20 x 60); 5.06,
8.0 (S. Baroni, Milan, Italy, 40 x 80); 7.32, 8.0 (P. M. Raymundo, Salvador,
Brazil, 11 x 80).  T. Pauwels (Royal Observatory, Uccle, 0.85-m f/2.5 Schmidt
+ CCD) remarked on June 29.1 UT on tails of 14' in p.a. 267 deg, 8' in p.a.
249 deg and 4' in p.a. 270 deg.  M. Jager (Vienna, 0.25-m Schmidt, pg)
remarked on July 7.0 on a type II tail extending 25' in p.a. 267 deg and
type I tails extending 50' in p.a. 275 and 278 deg).
     MPEC 2000-N15 contains astrometric observations through July 6, new
orbital elements and the ephemeris below.  There is some indication that
the comet's motion is being influenced by nongravitational forces and that
the comet could therefore be progressively shifted northward of this
ephemeris, by perhaps up to 0'.1 by July 15 and up to 0'.6 by July 25.

2000 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
July  5     2 49.63    +47 06.4    0.846    0.869   54.7   72.7      8.0
      7     2 59.16    +49 17.4    0.773    0.851   54.8   77.3      7.7
      9     3 12.16    +51 50.7    0.701    0.835   54.5   82.3      7.4
     11     3 30.66    +54 49.1    0.632    0.821   53.8   87.9      7.1
     13     3 58.23    +58 11.6    0.565    0.807   52.4   93.9      6.8
     15     4 41.26    +61 43.8    0.504    0.796   50.3  100.5      6.5
     17     5 49.14    +64 34.5    0.450    0.786   47.5  107.5      6.2
     19     7 24.57    +64 46.6    0.408    0.778   44.2  114.3      6.0
     21     9 02.73    +60 17.7    0.381    0.772   41.2  119.8      5.8
     23    10 15.01    +51 36.6    0.373    0.768   39.8  122.1      5.7
     25    11 00.96    +41 08.6    0.385    0.765   40.6  120.3      5.8

                      (C) Copyright 2000 CBAT
2000 July 7                    (7449)              Brian G. Marsden

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