Arp 297:

North is left. (mirrored). 13.5x8.5 arcmin (0.35 arcsec/pixel) Total exposure time:410 * 30 seconds = 3.4 hours. (across 2 nights) Exposure used in stack: 329 * 30 seconds = 2.7 hours. Telescope: C9.25 (230mm, f/10, fl=2300mm) Camera: IMX533 (16mm diagonal, square, color) Processing: (no software sharpening used) Callibration (dark + flat) Stacking (average w/ rejection) White balance and background subtraction Asinh stretch Tone curve Crop Center left: NGC 5754 (z=0.015) and 5752 (z=0.015), a pair of gravitationally interacting spiral galaxies. Only the spiral pattern of NGC 5752 is visible. There is a tidal tail extending upwards, but it's too dim to see in this image. Center right: NGC 5755 (z=0.033), an irregular barred spiral galaxy. Right: NGC 5753 (z=0.032), a flocculant spiral (not elliptical) Another pair of interacting galaxies, but at a completely different redshift than Arp 297. Cool. There's actually a third member of this group (z=0.032) behind NGC 5752... although it…