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IAUC 7173: C/1999 K1; 1999ce; 1999aq; 1999by

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                                                  Circular No. 7173
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/1999 K1 (SOHO)
     D. A. Biesecker, SM&A Corporation and Goddard Space Flight
Center, reports observations of another apparent Kreutz sungrazing
comet that he discovered in images taken with the C3 coronagraph
aboard SOHO.  On May 20.47 UT, the comet was about 11 solar radii
from the sun and showed a tail; on May 20.51, V = 6.8.  Astrometric
measurements made by Biesecker (and reduced by B. G. Marsden,
Smithsonian Astrophysical Observatory), together with orbital
elements by Marsden, are given on MPEC 1999-K14.

     1999 UT            R.A. (2000) Decl.
     May 20.279        3 54.6       +16 59

     P. Garnavich, S. Jha, R. Kirshner, and P. Challis, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999ce was obtained with the 1.5-m Tillinghast telescope on May
18.2 UT that shows it to be a type-Ia supernova near maximum
brightness.  Narrow emission lines in the host galaxy provide a
redshift of 23 400 km/s.  The photospheric velocity derived from
the minimum of the Si II absorption is 12 100 km/s.

     Corrigendum.  L.-G. Strolger reports that the coordinates for
this supernova on IAUC 7125 were inadvertently provided for equinox
1950.0.  For equinox 2000.0, R.A. = 9h38m10s.79, Decl. =
-5 08'56".2.

SUPERNOVA 1999by IN NGC 2841
     Visual magnitude estimates, contributed in part by J. A.
Mattei, AAVSO:  May 4.86 UT, 13.5 (T. Kinnunen, Espoo, Finland);
5.974, 13.7 (B. H. Granslo, Fjellhamar, Norway); 6.842, 13.4 (K.
Hornoch, Lelekovice, Czech Republic); 8.995, 13.2 (P. Schmeer,
Bischmisheim, Germany); 9.92, 13.2 (R. J. Bouma, Groningen, The
Netherlands); 11.40, 13.6 (N. Biver, Oahu, HI); 12.017, 13.6 (M.
Suarez, Las Palmas, Canary Islands); 15.844, 13.3 (K. Hornoch,
Lelekovice, Czech Republic); 16.90, 13.2 (J. Carvajal, Madrid,
Spain); 18.899, 13.4 (M. Reszelski, Szamotuly, Poland).

                      (C) Copyright 1999 CBAT
1999 May 20                    (7173)            Daniel W. E. Green

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