PSN J12185771+4718113 2014 05 19.25 * 12 18 57.71 +47 18 11.3 14.8 z 1E 3S N4258 9 0
2014 05 21.888
This transient was observed on 2014 05 21.888 by Gianluca Masi, Francesca Nocentini and Patrick Schmeer, remotely using the 17"-f/6.8 corrected Dall-Kirkham robotic unit part of the Virtual Telescope Project facility, at Bellatrix Astronomical Observatory in Ceccano, Italy. 30-seconds exposures, unfiltered, show the source at mag. 13.5 (R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 57.69; 11.2 (J2000.0, mean residuals of 0.2" on both axes).
2014 05 21.90
Several low resolution spectra of this transient were obtained on 2014 05 21.90 by Gianluca Masi, Francesca Nocentini and Patrick Schmeer, remotely using the 14" robotic unit part of the Virtual Telescope Project facility in Ceccano, Italy. For this, we used a 100 lines/mm grating, with a dispersion of 34.5 angstroms/pixel. We see H-alpha emission around 6150 angstroms, suggesting this is a type II supernova. The spectrum and an image is available here: http://www.virtualtelescope.eu/?p=8059
2014 05 21.8300
I confirm the presence of this PSN (mag.+14.0) from several unfiltered images taken by 0.35m. Sch.-Cass. F/5.5 + SXVR H-9 CCD camera;35 sec.exposure; limit mag.+18.5; it is also present on an image taken on 2014/05/09.98(U.T.), mag.+17.0(difficult to estimate for the bright core),35 sec.exposure, limit mag.+18.5, same equipment; Giancarlo Cortini (Monte Maggiore Observatory-Predappio-ITALY).