Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

PSN J02224207+2816012

PSN J02224207+2816012   2013 08 27.6828*  02 22 42.07 +28 16 01.2  16.0 U   16E  36N  I221      9 1


2013 08 28.548

Discovered by M. Tsuboi, Hiroshima, Japan, on a frame (limiting mag.= 17.8) taken on 2013 August 27.683 UT using 0.30-m f/5.3 reflector + unfiltered CCD, which was confirmed on five frames taken on 2013 August 28.548 UT (limit mag.= 17.3) as a star of mag.= 15.6, who writes nothing is visible at this location on a frame taken on 2013 August 18.718 UT (limit mag.= 18.2).



2013 08 28.882

This transient was observed on 2013 08 28.882 by Gianluca Masi and Francesca Nocentini, remotely using the 17" robotic unit part of the Virtual Telescope Project facility in Ceccano, Italy. Unfiltered images show the source at mag. 16.3(R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 42.07s; 01.0" (J2000.0, mean residuals of 0.15" on both axes)



2013 08 28.966

This transient was observed on 2013 08 28.966 by Gianluca Masi and Francesca Nocentini, remotely using the 14" robotic unit part of the Virtual Telescope Project facility in Ceccano, Italy. Using a 100 lines/mm grating, providing a dispersion of 34.1 angstrom/pixel, we see clear Si II absorption around 6150 Angstroms, suggesting this is a type Ia supernova.



2013 08 28.713

Mag.= 16.0, position end figures 42s.07, 01".1 observed by K. Kadota, Ageo, Japan, from a stacked frame (limit mag.= 18.8) by ten frames exposed by each 90-s using 0.25-m f/5.0 reflector + unfiltered CCD (SBIG ST-9E). See an image at http://members.jcom.home.ne.jp/kenic-k/image/PSNinIC221-20130828.jpg.



2013 08 28.75

K. Ayani, Bisei Astronomical Observatory (BAO), Ibara, Okayama, Japan, obtained a low-resolution spectrum (range: 400 - 800 nm, resolution: 0.5 nm at H alpha) of PSN J02224207+2816012 with BAO 1.01-m telescope on Aug. 28.7 UT. The spectrum is of type Ia around maximum. The absorption minimum of Si II 635.5-nm feature is blueshifted by about 14000 km/s, assuming the resession velocity of IC221 to be 5090 km/s (Huchra et al. 1999, ApJS, 121, 287).



2013 08 29.547

Mag.= 16.4, position end figures 42s.07, 01".1 observed by T. Noguchi, Chiba-ken, Japan, from a stacked frame (limit mag.= 18.0) using 0.23-m f/6.3 Schmidt-Cassegrain + unfiltered CCD. See an image at http://park8.wakwak.com/~ngc/images/PSNinIC221.jpg.



2013 08 30.0269

Mag.: 15.9(V) R.A.: 02 22 42.08; Decl.: +28 16 00.9 (2000.0). Reference: PPMXL Observer: Massimiliano Martignoni - Observatory: Stazione Astronomica Betelgeuse (B75), Magnago, Italy Telescope: Schmidt-Cassegrain 0.25m-f/10.0 - CCD: KAF0261E



2013 08 30.41863

Mag.=16.0U, position end figures 42s.09 ,00".9 (UCAC4) remotely using 0.43-m f/4.5 astrograph + FLI-PL6303E (T21, iTelescope.NET, mayhill, NM, USA,H06). Magnitude and position were measured on an image composed from 3-frames which were taken by each 120-seconds exposure under the limiting magnitude = 20.0. Observer T. Yusa, Osaki, Japan Link to image, http://space.geocities.jp/yusastar77/supernova/PSNinI221_130830.htm



2013 08 29.699

This possible supernova in IC 221 was detected with 4 x 15 min images using an infrared filter Photometry: 16.40 +/- 0.29 IR > 700 nm (R for ref) Astrometry: RA 02 22 42.07 Dec +28 16 01.0 These data were collected by Joseph Brimacombe, Coral Towers Observatory, Cairns, Australia. Link to image and further information: http://www.flickr.com/photos/43846774@N02/9632344367/


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