The Whale Galaxy, NGC 4631, lies in Canes Venatici. The smaller galaxy above is NGC 4627.
Canon 60D with an Astronomik CLS LPR filter, at the prime focus of the KPO 18″ Reflector. 25 frames of 180 seconds each for a total exposure time of 75 minutes. Captured in Nebulosity, processed in StarTools, and finished in Aperture.