2011CBET.2851....2P

A. Pastorello, Dipartimento di Astronomia, Universita di Padova and Instituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova; V. Stanishev, Centro Multidisciplinar de Astrofisica, Istituto Superior Tecnico, Lisbon; and S. J. Smartt and M. Fraser, Queen's University, Belfast, on behalf of a larger collaboration, report that a spectrogram (range 320-910 nm, resolution 1.4 nm) of PSN J10091059+5150570, obtained by M. Lindborg on Sept. 30.22 UT with the Nordic Optical Telescope (+ ALFOSC), suggests that it is a "supernova impostor" sharing some similarity with the eruption of the luminous blue variable "UGC 2773-OT" (Smith et al. 2010, A.J. 139, 1451). The spectrum shows very narrow lines of H, Ca II (H and K and the near-infrared triplet, with P-Cyg profile), and a forest of narrow Fe II absorption features. Also, prominent Na I D, Sc II, and Ba II features are clearly detected in absorption. Note that, adopting for UGC 5460 a distance of 19.2 Mpc and a negligible reddening, the absolute magnitude of the transient would be about -14.4.