2012CBET.3156....2M

Additional CCD magnitudes for PSN J17522579-2126215: June 21.985, [12.0 (Herman Mikuz, Crni Vrh Observatory; 120-mm f/4 camera lens + CCD; object position close to edge of field); June 22.988, [12.0 (Mikuz); June 24.050, [12.0 (Mikuz); June 25.666, [16.0 (Itagaki); June 26.540, 9.9 (Yukio Sakurai, Mito, Ibaraki-ken, Japan; independent discovery on four 20-s frames taken with a Fuji FinePix S2 Digital Camera + Nikon 180-mm f/2.8 lens; position end figures 25s.59, 22".9, measured by S. Nakano, Sumoto, Japan, who noted a probable error of ± 5" and limiting magnitude about 11.5); June 26.640, 10.0 (Itagaki); June 27.192, 9.0 (C. Jacques and E. Pimentel; using a 0.25-m f/3.4 astrograph + clear filter at the RAS Observatory near Mayhill, NM, U.S.A.; position end figures 25s.79, 21".9; limiting mag 15.8; image posted at URL http://ceamig-rea.net/tocp/PNV_J17522579-2126215.jpg); June 26.919, R = 9.7 (Mikuz); June 27.193, 9.9 (Jacques and Pimentel; red filter); June 27.194, 10.1 (Jacques and Pimentel; visual filter); June 27.195, 10.5 (Jacques and Pimentel; blue filter); June 27.253, B = 11.2, V = 9.7, R_c = 8.7, I_c = 7.7 (T. Yusa, Osaki, Japan; position end figures 25s.77, 21".5, USNO-B1.0 reference stars; remotely using a 0.25-m f/3.4 hyperbolic astrograph + SBIG ST-10XME camera at the RAS Observatory, iTelescope network, near Mayhill; position and magnitude measured from a three co-added 30-s images, limiting magnitude 15.7); June 27.3, R = 8.9 (Ernesto Guido, Giovanni Sostero, and Nick Howes; remotely with a 0.10-m f/5 reflector of the ITelescope network of the RAS Observatory near Mayhill; position end figures 25s.79, 21".6; reference stars from CMC-14 catalogue; an animation showing a comparison between their image and a red Digitized Sky Survey plate from 1996 is posted at URL http://bit.ly/M3mhZn; their annotated confirmation image is posted at URL http://bit.ly/OrjMA9); June 27.3101, V = 9.804 ± 0.032 (Carl Hergenrother, Lunar and Planetary Laboratory, University of Arizona; obtained remotely with the Sierra Stars 0.61-m telescope; V and B magnitudes derived from the AAVSO VPHOT program, while the R-band magnitudes were measured using stars from the CMC-14 catalogue; position end figures 25s.79, 21".7, relative to the CMC-14 astrometric catalogue); June 27.3129, B = 11.311 ± 0.009 (Hergenrother); June 27.355, B = 11.36, V = 9.80, R_c = 8.82, I_c = 7.65 (Seiichiro Kiyota, Tsukuba, Japan; 25-cm reflector + SBIG ST-10XME CCD camera located near Mayhill – T4, iTelescope.net – used for photometry; position end figures 25s.69, 21".8; 43-cm reflector + FLI-PL6303E CCD camera – T21 – used for astrometry); June 28.3075, V = 11.019 ± 0.046 (Hergenrother); June 28.3083, B = 12.282 ± 0.024 (Hergenrother); June 28.3107, R = 9.62 ± 0.06 (Hergenrother); June 28.612, I_c = 8.56 (Hiroyuki Maehara, Kwasan Observatory, Kyoto University; 0.25-m telescope); June 28.613, R_c = 9.24 (Maehara); June 28.614, V = 11.24 (Maehara); June 28.616, B = 12.49 (Maehara). Jacques and Pimentel note that no progenitor star could be identified on a Palomar Sky Survey plate from Sept. 1950. Mikuz's June 26 image is posted at website URL http://www.observatorij.org/vstars/PNVJ17522579-2126215.jpg; Yusa's image is posted at http://space.geocities.jp/yusastar77/supernova/PSNinSgr_120627.htm.