SIMBAD references

Giancarlo Cortini, Predappio, Italy, reports the discovery of an apparent supernova (mag 17.5) on several unfiltered CCD images (limiting mag 18.5) taken on Dec. 17.735 UT with a Celestron 14 telescope (+ Starlight X-Press SXVR-H9 camera). The new object is located at R.A. = 16:17:18.87, Decl. = +59:19:29.8 (equinox 2000.0), which is 15" west and 17" north of the center of UGC 10331. Nothing is visible at this position on Cortini's images taken on Oct. 3.85 and Nov. 13.8 (limiting mag 18.5) or on Palomar Sky Survey red and blue plates. The variable was designated PSN J16171887+5919298 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011jg based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2011jg: Dec. 18.524, 17.7 (Joseph Brimacombe, Cairns, Australia; luminance filter presumably used, though not explicitly stated; position end figures 18s.96, 29".4; image posted at the following website URL: http://www.flickr.com/photos/43846774@N02/6535449281/); 23.780, R = 17.3 (Federica Luppi, Varese, Italy; 0.36-m f/7.9 reflector + Bessell R filter; position end figures 18s.91, 29".3; NOMAD catalogue reference stars).