2010CBET.2595....1Y

T. Yusa, Osaki, Miyagi, Japan, reports his discovery of an apparent nova (mag 16.6) in M33 on twelve 90-s unfiltered CCD frames (limiting mag 18.5) taken around Dec. 17.421 UT using a 30-m f/7 Cassegrain telescope (+ SBIG STL-1001E camera). The new object is located at R.A. = 1:34:17.98 ± 0s.03, Decl. = +30d43'58'.3 ± 0".3 (equinox 2000.0; star catalogue UCAC-3), which is 350" east and 261" north of the center of the galaxy M33. Additional unfiltered CCD magnitudes by Yusa for M33N 2010-12a: 1991 Oct. 6, [20 (Digitized Sky Survey); 2010 Dec. 8.425, [18.5; 10.448, [18.5; 18.48, 17.5. Yusa's discovery image has been posted at the following website URL: http://space.geocities.jp/yusastar77/PNinM33_101217.htm. Other confirming reports of M33N 2010-12a by observers using unfiltered CCD cameras are given below:

---------------------------------------------------------------------------— Date UT R.A. (2000.0) Decl. Mag. Observer ---------------------------------------------------------------------------— Dec. 17.645 1 34 18.01 +30 43 58.0 16.4 Itagaki 17.647 1 34 18.03 +30 43 58.3 16.7 Kadota 18.357 1 34 18.01 +30 43 58.2 17.7 Itagaki 18.486 1 34 18.02 +30 43 58.1 17.2 Nishiyama ---------------------------------------------------------------------------—

K. Itagaki, Teppo-cho, Yamagata, Japan. 0.30-m f/7.8 reflector (+ Bitran BT-214E camera) at Tochigi station; limiting mag 19.0. Position on Dec. 18 measured by H. Kaneda, Sapporo. Communicated by S. Nakano, Sumoto, Japan. K. Kadota, Ageo, Saitama-ken, Japan. 0.25-m f/5 reflector (+ SBIG ST-9E camera); limiting mag 18.0. Communicated by S. Nakano. K. Nishiyama, Kurume, Japan; and F. Kabashima, Miyaki, Japan. Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera); limiting magnitude 18.6.