------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 3173 2016 May 29 14.08UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074 INTERNET: GUY@TAHQ.DEMON.CO.UK Backup: gmh@wdcc1.bnsc.rl.ac.uk WORLD WIDE WEB http://www.theastronomer.org ------------------------------------------------------------------- KAIT-16X SUPERNOVA IN NGC 4125 (= SN 2016COJ) WelKang Zheng et.al. reports on ATEL 9095 for the KAIT survey their discovery of a supernova in NGC 4125 (In elliptical galaxy in Draco) using the 0.76-m Katzman Automatic Imaging telescope. The new object is located at: RA 12h 08m 06.80s DEC +65 10’37.9” (2000). Following discovery in an unfiltered image obtained at 04:24 UT on 2016 May 28, they manually started a sequence of follow-up observations in the U, B, V, R, I, and clear and measured the magnitude as R=14.8 at discovery time. The target was also marginally detected 4 days earlier on 2016 May 24.19 UT with R~17.7, indicating the object might be young. No detection at the SN location from an image taken on May 19.27 with a limiting mag of ~18.5. A finding chart was posted at the following website: http://w.astro.berkeley.edu/~zwk/findingchart/2016coj_KAIT-16X.jpg A CCD spectrum (range 350-800 nm) was obtained on May 28.35, only 4 hours after discovery, with the Shane 3-m reflector (+ Kast spectrograph) at Lick Observatory. The spectrum shows that SN2016coj is a Type Ia supernova. Cross-correlation with a library of supernova spectra using SNID indicates a best match with normal Type Ia SN2002er at age -6 days, as well as a few other templates around one week time before maximum light. Adopting the host redshift z=0.00448, the rest-frame photospheric velocity estimated from the minimum of the Si II 635.5-nm feature, is about 15400 +/- 100 km/s. Guy M Hurst ---------------------------------------------------------------------------- ------------------ Guy M Hurst 16 Westminster Close, Basingstoke, Hampshire, RG22 4PP, England Tel/FAX (01256) 471074 Internet: guy@tahq.demon.co.uk Mobile: (07905) 332226 Personal WWW: http://www.guyhurst.co.uk Editor of The Astronomer                       http://www.theastronomer.org ---------------------------------------------------------------------------- ------------------