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SN2009dn is a Type II Supernova

ATEL # 2059; M. M. Kasliwal and R. Quimby (Caltech)
on 27 May 2009; 0:16 UT
Password Certification: Mansi Manoj Kasliwal (

Subjects: Optical, Nova, Supernova, Transients

We took a spectrum of SN2009dn (discovered by Yuan et al. ATel#2018) with the Double Beam Spectrograph on the Palomar Hale Telescope on May 20.329 UT. The data show a prominent, broad H-alpha feature in emission. The spectrum is similar to the Type II-L supernova 1979C at about 1 month past maximum (Branch et. al 1981, ApJ 244,780).

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