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IAUC 7204: SUNGRAZING COMETS; C/1998 M5

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                                                  Circular No. 7204
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, SM&A Corporation and Goddard Space Flight
Center, reports observations of three more apparent Kreutz
sungrazing comets found in images taken with both the C2 and C3
coronagraphs aboard SOHO.  Astrometric measurements made by
Biesecker (and reduced by B. G. Marsden), together with orbital
elements by Marsden, are given on MPECs 1999-M08 (C/1999 K9),
1999-M09 (C/1999 K10), and 1999-M10 (C/1999 L4).

     1999 UT           R.A. (2000) Decl.       Comet
     May  23.698       4 03.8      +18 13      C/1999 K9
          31.698       4 33.4      +19 47      C/1999 K10
     June  1.448       4 33.9      +19 37      C/1999 L4

Comets C/1999 K9 and C/1999 L4 were discovered by A. Vourlidas;
C/1999 K10 was discovered by Biesecker.  No tail is evident for
C/1999 K9 on images obtained during May 23-24.  No tail is visible
in the May 31-June 1 images of C/1999 K10; this object was
extremely faint in the C3 images.  A faint tail is visible is
visible in the June 1 images of C/1999 L4, which was again very
difficult to measure in the C3 frames.


COMET C/1998 M5 (LINEAR)
     Ephemeris extension to IAUC 7137:

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 21     9 20.61   +24 25.7   3.129   2.537   46.3   16.8   12.5
     26     9 25.19   +22 47.6   3.228   2.580   43.0   15.6   12.7
July  1     9 29.74   +21 13.9   3.325   2.623   39.6   14.3   12.8
      6     9 34.25   +19 44.2   3.418   2.667   36.3   13.0   12.9
     11     9 38.71   +18 17.9   3.508   2.710   32.9   11.7   13.1

     Total visual magnitude estimates:  May 16.86 UT, 10.9 (M.
Reszelski, Szamotuly, Poland, 0.25-m reflector); 24.88, 11.7 (W.
Hasubick, Buchloe, Germany, 0.44-m reflector); June 3.89, 12.2 (M.
Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector); 13.30,
12.5 (N. Biver, Oahu, HI, 0.26-m reflector).

                      (C) Copyright 1999 CBAT
1999 June 18                   (7204)            Daniel W. E. Green

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