M91 is a rare face-on barred spiral galaxy lying at a distance of 63 million-light years in Canes Venatici. It is part of the Virgo Cluster of galaxies. Overall, it is one of the faintest objects in the Messier Catalog, but its core is thousands of times brighter than its faint spiral arms, so it requires skillful processing to show the spiral arms without blowing out the core and bar.

Exposures: L:R:G:B = 180:80:80:80 minutes = 7 hours total exposure at f/6.8.