Electronic Telegram No. 2262 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html POSSIBLE NOVA IN SCORPIUS Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan report their discovery of another possible nova (mag 8.6) on two 40-s unfiltered CCD frames (limiting magnitude 13.1) taken around Apr. 25.788 UT using a 105-mm f/4 camera lens (+ SBIG STL6303E camera). Five follow-up 2-s unfiltered CCD frames (limiting magnitude 17.3) taken around Apr. 25.796 using a Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera) yield the following precise position for the variable: R.A. = 16h55m13s.16, Decl. = -38d03'46".9 (equinox 2000.0). Nothing is visible at this position on their past survey frames taken on Apr. 23.786 (limiting mag 12.9) and 24.757 (limiting mag 13.2) or on a Digitized Sky Survey image from 1995 June 4 (limiting red mag 18.0). After the Central Bureau received the above report, S. Nakano, Sumoto, Japan, forwarded two independent discoveries of this possible nova to the Bureau, the first by Hideo Nishimura (Miyawaki, Kakegawa, Shizuoka-ken, Japan) on two 13-s CCD exposures (limiting mag 10.5) taken on Apr. 25.763 UT with a Minolta 120-mm f/3.5 camera lens (+ Canon EOS 5D digital camera mounted on a Takahashi EM100 equatorial telescope), with Nishimura providing magnitude 8.3 and position end figures 12s.96, 48".1. The second report forwarded by Nakano is from Tadashi Kojima (Tsumagoi, Agatsuma-gun, Gunma- ken, Japan), who found the presumed nova on two CCD frames (limiting mag 11.2) taken on Apr. 25.738 UT using a Canon EOS 40D digital camera with a 50-mm f/2.8 camera lens, mounted on a Sky-Memo equatorial instrument; Nakano measured mag 8.8 and position end figures 13s.46, 44".7 (uncertainty +/- 5") from Kojima's frame. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 April 26 (CBET 2262) Daniel W. E. Green