North is right. 0.52"/pixel (18'x9' field) FWHM=4.5" The pair of galaxies near the center is NGC 6285 (top) and NGC 6286 (bottom). The lower one has a distinct tidal trail below it, and a faint bridge to the upper galaxy is visible. Both sit around z=0.018. The edge on galaxy is UGC 10641, and sits at a similar redshift to the pair at z=0.018, indicating that this is probobly a group of three gravitationally bound galaxies. My field also included a galaxy cluster around 16h57m49s +58°46'55": The brightest member, LEDA 2582489 has a reshift of around z=0.11, which puts it at a comoving distance of 1.5 Gly, way beyond the main target of the photo. Total exposure time:341 * 30 seconds = 2.8 hours. Telescope: C9.25 (230mm, f/10, fl=2300mm) + 0.63 Starizona reducer Camera: IMX533 (16mm diagonal, square, color) Processing: Callibration (dark + flat) Stacking (average w/ outlier rejection) White balance and background subtraction (no gradient removal) Asinh stretch (color preserving) It…
No comments yet. Log in to reply on the Fediverse. Comments will appear here.