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Circular No. 8813 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) SUPERNOVAE 2007V, 2007W, 2007X, 2007Y, 2007Z Five apparent supernovae have been discovered on unfiltered CCD frames and reported to the Central Bureau: 2007V by N. Joubert and W. Li (LOSS/KAIT; cf. IAUC 8804); 2007Z by E. J. Christensen (Mt. Lemmon Survey 1.5-m telescope); and the rest by L. A. G. Monard (Pretoria, S. Africa, 0.35-m reflector). Discovery observations: SN 2007 UT R.A. (2000.0) Decl. Mag. Offset 2007V Feb. 12.46 10 27 05.58 - 3 18 05.1 17.9 0".3 E, 1".8 S 2007W Feb. 15.037 13 21 48.50 -13 12 56.9 17.1 8" W, 33" S 2007X Feb. 15.068 14 30 14.50 -36 57 53.1 15.3 30" E, 2" S 2007Y Feb. 15.774 3 02 35.92 -22 53 50.1 17.5 24" W, 110" S 2007Z Feb. 17.221 5 15 42.68 +19 21 49.5 17.5 10".4 W, 2".7 N Additional information is available on these objects on the following Electronic Telegrams: 2007V, CBET 841 (type Ia, discovered about 1 month past maximum); 2007W in NGC 5105, CBETs 844 and 846 (type II); 2007X in ESO 385-G32, CBETs 844 and 849 (young type II); 2007Y in NGC 1187, CBET 845; 2007Z in PGC 16993, CBETs 847 and 849 (young type II). Additional LOSS/KAIT magnitudes for 2007Y from R. Mostardi and W. Li: 2006 Dec. 24.27 UT, [18.1; 2007 Jan. 19.23, [17.5; 26.21, [17.3; Feb. 15.15, 16.7 (independent discovery). Li provides position end figures 35s.94, 49".4 for 2007Y. COMETS C/2006 W5, C/2006 W6, C/2006 W7, C/2006 X2 (SOHO) Additional Kreutz sungrazing comets have been found on SOHO website images (cf. IAUC 8811). K. Battams notes that C/2006 W5 appeared as a fuzzy streak about 2' long and quite faint (mag about 7.5). C/2006 W6 was very small, quite diffuse, and very faint (mag 8). C/2006 W7 was also very small and faint (mag about 7.5), and slightly diffuse. C/2006 X2 was very diffuse, faint, and somewhat elongated. Comet 2006 UT R.A.(2000)Decl. Inst. F MPEC C/2006 W5 Nov. 20.004 15 40.3 -21 16 C2 TH 2007-B76 C/2006 W6 20.038 15 40.2 -21 21 C2 TH 2007-B76 C/2006 W7 25.479 16 03.1 -22 28 C2 RK 2007-B76 C/2006 X2 Dec. 9.049 17 04.6 -24 41 C2 RK 2007-B76 (C) Copyright 2007 CBAT 2007 February 26 (8813) Daniel W. E. Green
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