M51 (NGC 5194) in Canes Venaciti.
Right Ascension: 13h:29.9m, Declination: 47d:12m(deg:m)
Visual Brightness: 8.4 Mag, Apparant Dimension is 11.2 x 6.9 arc minutes,
The first image is made up of 9 * 60 second images camera cooled -15degree C below ambient. Images co-added after autodark subtract. It is at 400mm f1.95 Fastar image making it a 41.1 x 30.8 arc minute frame. Imaged 03/18/2003. There is no guideing.
The second / right image is
3*300s at f1.95 Fastar. Imaged 03/10/2003 at Wye Mtn Observatory. The camera was cooled to -25degree C below ambient temp. It is cropped from a 640x480 pixcel image of 41.1x30.8 arcminutes. It is roughly 20.48 arcminutes wide by 16.11 arcminutes tall. Guided with C102 f10 and SBIG ST4 camera.
5 minutes each of read, green, blue and luminance added. July 19, 2004
to CCD images .