2004IAUC.8399....2B

T. Boles (cf. IAUC 8397) and M. Armstrong (cf. IAUC 8397) independently report their discoveries of an apparent supernova on unfiltered CCD images. Boles' measured position for the new object is R.A. = 22h42m10s.02, Decl. = +19o59'40".4 (equinox 2000.0), which is approximately 7".2 west and 9".2 south of the center of UGC 12158. Approximate magnitudes for SN 2004ef: 2003 Dec. 15 UT, [19.0 (Armstrong); 2004 July 16, [19.5 (Boles); Aug. 19, [19.5 (Boles); Sept. 4.056, 18.5 (Boles); 4.821, 18.5 (Boles); 5.078, 17.5 (Armstrong); 5.861, 17.5 (Armstrong). Position end figures for SN 2004ef by Armstrong are 09s.97, 40".1; he adds that nothing is visible at this location on Palomar Sky Survey images from 1990 (limiting red mag 20.8) and 1992 (limiting blue mag 22.5).