We report a new SN discovered by F. Ciabattari, E. Mazzoni and S. Donati on behalf of Italian Supernovae Search Project (ISSP) near PGC 22658.
Data from Latest Supernovae:
2016aa (= PS16us), TNS discovered 2016/01/17.880 by F. Ciabattari, E. Mazzoni and S. Donati (ISSP)
Found in PGC 22658 at R.A. = 08h04m16s.02, Decl. = +61°33'42".7
Located 0".0 east and 0".0 north of the center of PGC 22658 (Fabrizio Ciabattari image) (Joseph Brimacombe image) (Masanori Mizutani image) (PS1 image) (G. Locatelli image) (Thomas Langhans image) (Paolo Campaner image) (M. Caimmi image)
Mag 18.7:2/4 (18.2:1/23), Type II (z=0.03) (offset 13.6) (References: ATEL 8641)
See discovery image and classification ATEL.
Asiago spectroscopic classification of SN2016aa in PGC 22658
on 5 Feb 2016; 16:32 UT
Distributed as an Instant Email Notice Supernovae
Subjects: Optical, Supernovae
We report the spectroscopic classification of SN2016aa in PGC 22658 through observations obtained with the 1.82-m Copernico Telescope in Asiago (+ AFOSC; range 340-820 nm, resolution 1.3 nm).
A low signal-to-noise spectrogram obtained on Jan 04.97 UT indicates that SN2016aa is a Type II SNe, a few weeks after the explosion. The redshift, as inferred from the narrow emission lines of the host galaxy, is z = 0.03.
Photometry was obtained with AFOSC on Jan. 04.98 UT, providing the following magnitudes (sloan, ABmag): g = 18.67+-0.05, 18.36 +- 0.05 18.28+-0.06. Addditional unfiltered photometry was obtained by amateur astronomers. This has been calibrated with USNO reference stars (V band), and the following magnitudes have been obtained: Jan 17.88 UT, 18.5 (0.5); Jan 19.96 UT, 18.5 (0.5); Jan 22.01 UT, 18.2 (0.2); Feb 4.10, 18.3 (0.2); Feb 4.95, 18.3 (0.2).
As the supernova magnitudes remained almost constant (within the error bars) over 18 days, we suggest that AT2016aa can be more precisely classified as a Type II-P SN.
The Asiago classification spectra are posted at this website: URL http://sngroup.oapd.inaf.it ; classification(s) was(were) made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).