NGC 891 (also known as Caldwell 23, the Silver Sliver Galaxy, and the Outer Limits Galaxy) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster. It has an H II nucleus.
The NC891 image is made from 30x4 - minute subframes captured, pre and post process using AstroArt 8sp4. The imaging camera was a ZWO ASI533 OSC mounted on an AT6RC scope. The AT6RC was mounted on an AP900. An 80mm refractor was piggyback on the AT6RC for auto-guiding using a ZWO ASI120 camera. Auto-guiding was preformed using PHD2 guiding software. AstroArt 8 and PHD2 ran on a HP minicomputer at the AP900 mount. Remote imaging control was over a 100 Mb Ethernet connection to a Dell laptop. Noise reduction was preformed using Topaz DeNoise AI.
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