The side-on-visible spiral galaxy NGC 891, also called the Outer Limits Galaxy. I consider it to be a very special object because it’s arguably one of my best images: I like the side-on view with lots of details in the galaxy and the nice colorful stars. This image was done with a Celestron C8, the original 0.63x reducer/corrector and a Nikon D3400 (unmodified). Everything was mounted on a Skywatcher HEQ5 (with Rowan Belt Mod) together with 15 kg of counterweights on my backyard pier. Integration time is a almost 9 hrs from three nights.

Raw stack from PixInsight can be downloaded here. It was calibrated with bias and flat frames. Standard settings from WBPP (2024) were used, incl. CFA drizzle at scale 1. It is slightly oversampled. This is 107x 300s at gain 101.

My processed imaged with details can be found on Astrobin. You can read about the this galaxy here on Wikipedia.