Electronic Telegram No. 1429 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 SUPERNOVA 2008dx E. Y. Hsiao, M. L. Graham, C. J. Pritchet, and D. Balam, Department of Physics and Astronomy, University of Victoria, report that a spectrum (range 392-704 nm; resolution 0.3 nm) of 2008dx (cf. CBET 1427), obtained on June 28.33 UT with the 1.82-m Plaskett Telescope of the National Research Council of Canada, shows it to be a type-Ia supernova near maximum light. Cross-correlation with a library of supernova spectra using the "superfit" matching program of Howell et al. (2005, Ap.J. 634, 1190) indicates that 2008dx is most similar to the sub-luminous type-Ia supernova 1991bg near maximum light. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 July 3 (CBET 1429) Daniel W. E. Green