2005IAUC.8636....3H

D. A. Howell, University of Toronto, on behalf of the Supernova Legacy Survey (http://xxx.lanl.gov/abs/astro-ph/?0510447), reports the discovery of a supernova at magnitude i'(AB) = 22.3 on Nov. 24.3 UT on Megacam images obtained with the Canada-France- Hawaii Telescope. SN 2005ky, which had brightened to i'(AB) = 21.0 by Dec. 1.3, is located at R.A. = 2h24m36s.254, Decl. = -4o10'54".94 (equinox 2000.0), which is 0".33 west and 3".40 south of the center of its host galaxy. A spectrogram of 2005ky, obtained by M. Sullivan and R. S. Ellis on Nov. 30.3 with the Keck I telescope (+ LRIS), indicates that this is a type-Ia supernova about one week before maximum light. A redshift of z = 0.148 was determined from host-galaxy Ca H and K absorption. The supernova shows a blue wing on the Si II 635.5-nm feature that is a possible indication of high-velocity features. The expansion velocities are relatively high for this epoch: 15000 km/s determined from Si II 635.5-nm and 27000 km/s determined from Ca II H and K and the Ca II infrared triplet. There is no apparent feature at 580 nm, and the blue part of the S II 'W' at 540 nm is enhanced relative to the red absorption. Strong Na D from the host galaxy indicates that there may be extinction along the line-of-sight to this supernova.