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IAUC 7452: SUNGRAZING COMETS; 2000ck

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                                                  Circular No. 7452
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)


SUNGRAZING COMETS
     D. A. Biesecker, Emergent Information Technologies, Inc., and Goddard
Space Flight Center, reports observations of twelve more Kreutz sungrazing
comets detected with the SOHO/LASCO C2 coronagraph.  The 1998 and 1999
comets were found by M. Oates from archival data in the SOHO website.
The 2000 comets were found in current data in the website by M. Meyer
(C/2000 M3), by Meyer and M. Boschat (C/2000 M4) and by A. Mimeev and
P. Shkreby (C/2000 M5).  Positions have been measured by D. Hammer (in
collaboration with Biesecker in the case of the very faint and diffuse
object C/2000 M3) and reduced by B. G. Marsden.  Discovery positions follow.
The complete measurements and orbital elements are given on MPEC 2000-N26.

     1998 UT           R.A. (2000) Decl.       Comet
     June  6.644       4 54.7      +20 50      C/1998 L7
           8.334       5 02.0      +21 02      C/1998 L8
          12.226       5 18.7      +21 21      C/1998 L9
          19.414       5 46.8      +21 44      C/1998 M8
          21.622       5 55.3      +21 45      C/1998 M9
          23.644       6 02.9      +21 59      C/1998 M10

     1999 UT           R.A. (2000) Decl.       Comet
     June  1.299       4 34.6      +20 18      C/1999 L6
           3.129       4 40.5      +20 25      C/1999 L7
           6.310       4 54.2      +20 53      C/1999 L8

     2000 UT           R.A. (2000) Decl.       Comet
     June 19.347       5 49.0      +21 41      C/2000 M3
          22.121       5 59.9      +21 38      C/2000 M4
          24.132       6 07.0      +22 00      C/2000 M5


SUPERNOVA 2000ck IN IC 4355
     A. V. Filippenko, R. Chornock and M. Modjaz, University of California
at Berkeley, report that inspection of a CCD spectrum (range 320-1000 nm)
of supernova 2000ck obtained on July 6 with the Shane 3-m reflector at the
Lick Observatory confirms that the object is a type II supernova (cf. IAUC
7434).  Weak (though distinct) broad H-alpha emission has appeared, but
there is essentially no absorption component to the profile.  This behavior
is similar to that of the type II-L supernovae 1979C and 1980K (see
Filippenko 1997, Ann. Rev. A. Ap. 35, 309 for a relevant discussion).

                      (C) Copyright 2000 CBAT
2000 July 11                   (7452)              Brian G. Marsden

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