2010CBET.2565....2M

G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group; and D. Griep, NASA Infrared Telescope Facility (IRTF), report that a near-infrared spectrum (range 700-2400 nm) of SN 2010kg (cf. CBET 2561) was obtained on Dec 3.4 UT with the SpeX instrument on the IRTF 3.0-m telescope. The spectrum exhibits unusually high velocities with lines from O I, Mg II, and Si II found between 18000 and 20000 km/s. The Ca II infrared triplet (857.9 mn) is exceptional strong, and the absorption-line profile has a square bottom with the blue side near 32000 km/s and the red side near 26000 km/s. The blue wings of the Ca II feature extend to at least 40000 km/s, where they blend with O I and Si II. Possible identifications are made for Si III and Fe III. CI is not observed.