M33 is a well studied galaxy and has many prominent emission structures with multiple survey catalogs of these structures. I focused on four catalogs (BCLMP, CPSDP, [LHK2017], and [RVP2013]) for the annotated image. I grouped them (circled) into similar parts of M33 and listed the contained emission items. There are also emission structures of M33 in the
There are also several background galaxies and Quasars in this image that can be seen in the full size and annotated images.
Click the image below - it links to the main page with image and additional information. There is also a link below to the full
Full
M33 with Emission Structures(Sh2-221)
Annotated Image (Pan and Zoom):
M33 with Emission Structures Annotated
Images also available on astrobin -M33 with Emission Structures
Scope: FSQ-106N at f/5
Camera: ASI2600MM (Astronomik type 2c Ha OIII, LRGB, filters)
Location: DAA Observatory, Shelter Valley, CA