The Whirlpool Galaxy M51 LRGB + HA We had a short lived recess in bad weather and on wednesday night I was able to complete the final chapter by adding 3 hours of hydrogen alpha and adding this to the RGB and luminance captured over 4 nights in april. Total Exposure time 13 hours and 40 minutes. There are several tiny galaxies in this image, IC4277 and IC4278 to the left of NGC 5195 but as to the name of the little galaxy above and right of NGC 5195, at about 1 o'clock, I am still unable to locate any documentation or maps that refer to it's name Clear Skies Terry Hancock www.downunderobservatory.com Image details 16 x 10 min each RGB un binned 16 x 10 min Luminance un binned 12 x 15min HA @10nm un binned Location: DownUnder Observatory, Fremont MI Date of Shoot 12th,13th,18th, 19th April, 9th May 2012 Camera: QHY9M monochrome CCD www.astrofactors.com StarlightXpress Color Filter Wheel Scope: Astronomy Technologies Astro-Tech 10" f/8 Ritchey-Chrétien astrograph Astro Tech 2" Field Flattener. Autoguided using QHY5 autoguider, StarlightXpress Ultra Slim Off Axis guider Paramount GT-1100S German Equatorial Mount (with MKS 4000) Image Aquisition software Maxim DL5 Registed, Calibrated and Stacked in CCD Stack Post Processed with Photoshop CS5