2010CBET.2328....2K

K. Kinugasa, H. Takahashi, and O.Hashimoto, Gunma Astronomical Observatory (GAO), write that a low-resolution spectrum (range 420-800 nm; resolution about 500) of 2010dq was obtained on June 16.7 UT with the GAO 1.5-m telescope (+ GLOWS). The spectrum most resembles to that of a typical type-Ia supernova. Comparison with a library of spectra via the "Supernova Identification" code (Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2010dq is most nearly similar to SN 1992A about 9 days after maximum. Adopting the NED recession velocity of 5440 km/s for NGC 57 (de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Galaxies, ver. 3.9), the expansion velocity derived from the Si II absorption minimum (rest 635.5 nm) is about 9500 km/s.