Electronic Telegram No. 1992 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 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://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2009ju, 2009jx, AND 2009ka P. Challis, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrum (range 330-850 nm) of 2009ka (cf. CBET 1985), obtained on Oct. 21 UT by S. Tang with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-IIb supernova. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2009ka best matches type-IIb supernovae. J. Brimacombe, Cairns, Australia, reports that SN 2009ka appears to be brighening; a stack of eight 300-s luminance-filtered images (limiting magnitude 19.5) taken using a 0.4-m reflector on Oct. 22.45 UT revealed magnitude 16.9. A follow-up stack of ten 600-s luminance-filtered images (limiting magnitude 21.0) taken remotely with a 0.5-m reflector in New Mexico on Oct. 23.2 revealed 2009ka at magnitude 17.0. The images have been posted at website URL http://www.flickr.com/photos/43846774@N02. J. M. Silverman and A. V. Filippenko, University of California, Berkeley; and R. J. Foley, Harvard-Smithsonian Center for Astrophysics, report that inspection of CCD spectra (range 340-1010 nm), obtained on Oct. 22 UT with the Keck I 10-m telescope (+ LRIS), shows that 2009ju (CBET 1974) is a type-II supernova; the H-alpha emission component greatly dominates over the absorption. SN 2009jx (CBET 1979) is also a type-II supernova, shortly after explosion; the spectrum is quite blue and nearly featureless, showing only very weak Balmer lines. A spectrum of 2009ka shows it to be a type-II supernova, probably of type IIb (although the He I lines are not yet obvious); cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that it is most like the type-IIb supernova 1993J about four days before maximum light. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 October 23 (CBET 1992) Daniel W. E. Green