SN1999ev – discovery

Tom Boles

Tom’s fourth supernova, discovered in NGC 4274 on 7 November 1999 – on the same night that he discovered SN1999gg. IAU Circular 7306 : G.M. Hurst, Basingstoke, England, reports the discovery by Tom Boles, Wellingborough, of a supernova (mag 14.4) on a single unfiltered CCD frame secured for the UK Nova/Supernova Patrol on Nov 07.225 UT with a 0.36-m f/11 reflector. Boles measured the position of SN 1999ev to be RA 12h 19m 48s.33, Dec +29º 37' 22" 37’ 22”.2 (2000). Mark Armstrong, Rolvenden, provides position end figures 48s.24, 21".7 from an unfiltered CCD exposure taken on Nov 9.211 (mag about 14.5). Hurst notes that nothing is visible at this location in the Vickers Deep Space CCD Atlas: North (limiting mag about 17) or on an image obtained by M. Schwartz (Cottage Grove, Oregon) on 1998 Dec. 08. P. Garnavich, S. Jha, R. Kirshner, and P. Challis, Harvard–Smithsonian Center for Astrophysics, report that a spectrum of SN1999ev was obtained with the Fred L. Whipple Observatory (FLWO) 1.5-m Tillinghast telescope by P. Berlind on Nov 10.5 UT. The spectrum confirms that the object is a supernova and indicates that it is a type-II event past maximum.