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Discovery of PTF10heh, a Luminous Type IIn Supernova

ATEL # 2634; R. Quimby (Caltech), A. Gal-Yam, I. Arcavi, S. Ben-Ami, D. Xu, A. Sternberg (Weizmann Institute of Science), M. M. Kasliwal, E. O. Ofek, S. R. Kulkarni (Caltech), P. Nugent (LBNL), A. V. Filippenko, S. B. Cenko (Berkeley)
on 25 May 2010; 9:16 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Robert Quimby (

Subjects: Optical, Nova, Supernova, Transients

The Palomar Transient Factory (ATel #1964) reports the discovery of a new supernova, PTF10heh, located at RA = 12:48:52.04, Dec = +13:26:24.5 (J2000). PTF10heh was detected on April 4.30 UT with an R-band magnitude of 20.9 (calibrated with respect to the SDSS catalog). PTF10heh brightened to 20.1 mag on May 21.33 UT.

A spectrum of PTF10heh was obtained on May 15 UT with the Keck I 10-m telescope (+LRIS). The spectra show intermediate width emission lines from H-alpha and H-beta, and narrow absorption lines from the Mg II 2796,2803 doublet, from which we derive a redshift of z=0.338. With this redshift, the May photometry indicates a peak luminosity brighter than -21 mag absolute.

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R. E. Rutledge , Editor
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