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Circular No. 7567 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) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304 Phone 617-495-7440/7244/7444 (for emergency use only) COMETS C/2000 Y6 AND C/2000 Y7 (SOHO) Further to IAUC 7565, D. Hammer reports his measurements for two comets (initial observations given below) that appear to be two components of an earlier single comet. C/2000 Y6 and C/2000 Y7 were found by M. Meyer and by S. Hoenig, respectively, in C2 coronagraph data on SOHO website images. D. Biesecker provides V magnitudes for C/2000 Y6: Dec. 20.463 UT, 7.8; 20.504, 7.8; 20.580, 7.5; 20.588, 7.6; 20.604, 8.0; 20.646, 8.3. The reduced observations and parabolic orbital elements (T = 2000 Dec. 20.85 TT, q = 0.025 AU, Peri. = 88-89 deg, Node = 229 deg, i = 87-89 deg) by B. G. Marsden, together with a search ephemeris for groundbased observers, are given on MPEC 2001-B08. Comet 2000 UT R.A. (2000) Decl. C/2000 Y6 Dec. 20.454 17 48.7 -23 20 C/2000 Y7 20.463 17 48.8 -23 19 SUNGRAZING COMETS Hammer also reports his measurements for seven additional Kreutz sungrazing comets, all found in C2 data (except C/2001 A3, in C3 data) at the SOHO website by T. Scarmato (C/2000 J6), X. Leprette (C/2000 K7), M. Oates (C/2000 K8, C/2000 Y9), and M. Boschat (remaining comets). The reduced observations and orbital elements by Marsden appear on the MPECs cited below. Comet 2000 UT R.A. (2000) Decl. MPEC C/2000 J6 May 11.410 3 18.1 +16 37 2001-B11 C/2000 K7 19.160 3 47.4 +18 17 2001-B11 C/2000 K8 29.788 4 28.5 +20 07 2001-B11 C/2000 Y5 Dec. 19.736 17 58.8 -25 08 2001-B08 C/2000 Y8 23.788 18 17.7 -24 52 2001-B08 C/2000 Y9 25.121 18 23.6 -24 53 2001-B08 Comet 2001 UT R.A. (2000) Decl. MPEC C/2001 A3 Jan. 7.971 19 32.6 -24 10 2001-B11 (C) Copyright 2001 CBAT 2001 January 19 (7567) Daniel W. E. Green
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