PSN J23005471+1850323 2011 11 17.800 * 23 00 54.71 +18 50 32.3 17.0 U 6E 4S 9 0
2011 11 17.800
H. Mikuz and B Dintinjana report that possible supernova (mag 17.0) was found by J. Vales on four unfiltered CCD images (bandpass roughly equivalent to the R band) taken on 2011 Nov. 17.780-17.825 UT with the 60-cm f/3.3 Cichocki reflector in the course of the Comet and Asteroid Search Program (PIKA) at Crni Vrh Observatory. The new object is located at R.A. = 23h00m54s.71, Decl. = +18o50'32".3 (equinox 2000.0; uncertainty about 0".2), which is approximately 6" east and 4" south of the center of nearby galaxy. Image http://www.observatorij.org/vstars/PSN20111117/PSN20111117.jpg Nothing is visible at this location on archival PIKA images, obtained on 17 nights between 2004 Sep. 10 and 2011 Oct. 3 with limiting magnitudes 18.0-19.5. Also, nothing is visible at this position on several Digitized Sky Survey red and blue images from the Palomar Sky Survey.
2011 11 18.752
Follow-up observation by B. Dintinjana and H. Mikuz using the same telescope: R=17.03 +/-0.05 Comparison stars from USNO B1 catalogue, magnitude R2. SN photometry somewhat contaminated by nearby galaxy.
2011 11 20.1224
Object detected, but poorly resolved, at position end figures 54.71, 32.4 (UCAC3). Comparing to DSS image, object appears as an elongation to the southeast. Magnitude 17.3 U +/- 0.5. Limiting magnitude 20.3 . Sum of 24 x 60-sec images. Observer: R. A. Koff, Bennett, Colorado USA (H09). Image posted at: http://antelopehillsobservatory.org/SNpictures/PSNJ23005471+1850323final.jpg
2011 11 20.85
Asiago-Padova Spectroscopic ID: Type Ia SN few days before maximum
2011 11 21.772
Follow-up photometry by B. Dintinjana and S. Maticic using the same telescope: R=16.7 +/- 0.1 Comparison stars from USNO B1 catalogue, magnitude R2.