Two Supernova Remnant SH2-223 and SH2-224

This image shows the two nebula Sh2-223 and Sh2-224 in the constellation Auriga. Sh2-223 looks like a brain. This nebula is very dim and difficult to capture and process. It is a very niche shooting target. The larger circular structure that is associated with Sh2-223 was thought to be a supernova remnant.Sh2-224 is a very faint supernova remnant. The Rice Hat Nebula is located approximately 14,700 light-years away from Earth, and has an apparent size of 20 x 3 arc-minutes. Its true diameter is 163 light-years across. Sh2-224 is a supernova remnant, meaning it was formed when a star reached the end of its life and exploded. Sh2-224 is made up of two distinct parts, one being a massive round ball shape, and the other having the shape of a triangle. The way the triangle-shaped section lies by the round ball makes the nebula look like a person wearing a conical hat. Due to the target is too dim, the total exposure time of SH2-223 is about 140 hours. The total exposure time of SH2-224 is about 62 hours. They are both with HOO channel plus four mosaic images with RGB stars. In my photo, the red color in the nebula represents the light emitted by hydrogen atoms, while the blue-green color mainly comes from oxygen atoms.This photo was taken in December last year and January this year at my remote observatory in Zhangjiakou City, Hebei Province, China.

Image information: Date: Dec 2022 and Jan 2023; Telescope: TEC140ED APO with 0.72x AP Reducer lens; Camera: ASI ZWO 6200 MM; Mount: Paramount MX mount.