SUNSET: 
0
Photographer:
Rod Pommier
Location of Photo:
pommier Observatory, Portland, OR, USA
Date/Time of photo:
2024-03-31-2024-04-01
Equipment:
PlaneWave CDK17 on L500 mount, SBIG STL 11000 CCD camera with Baader Planetarium L, R, G, and B filters
Description:
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 is difficult to process the image to show the spiral arms without blowing out the core and bar. Numerous distant galaxies are visible in the background, including PGC 169575 directly above M91, PGC 169578 directly below it, PGC 41978 to its lower left, and a cluster of PGC galaxies in the left upper corner. Exposures: L:R:G:B =180:80:80 minutes =1 hour 20 minutes 7 hours total exposure at f/6.8, completely unguided. Exposures: L:R:G:B = 180:80:80:80 minutes = 7 hours total exposure at f/6.8.
