Here is an image of NGC 4559 and surrounding area. It is a barred galaxy with a weak inner ring and spiral features. NGC 4559 displays star forming regions. The classification is SAB(rs)cd. NGC 4559 is a member of the Coma I galaxy group and several larger groups [CHM2007] LDC 709 and LDC 867.
I am somewhat baffled by a group of objects in the southwest quad of the galaxy where different catalogs/surveys/observations report variously a HII item (NGC 4559C), a possible supernova candidate (PSN J12355230+2755559), a Luminous Blue Variable (AT2016blu), and a Galaxy Group (SDSSCGB 754 - w/5 members). I expected the galaxy group to be background since it is so small, but it has a distance estimate that puts it nearly adjacent to NGC 4559 itself. It seems odd to have such a group so close the the large gravitational pull of NGC 4559. This group of features is kind of a little speck to be studied so intensely.
Also in this image are galaxies IC 3598 and IC 3592. The latter is also known as NGC 4559A but is only associated visually since it is at an estimated distance of 334 million light years compared to NGC 4559's 36 million light years. Based on its estimated distance, NGC 4559 spans about 81,000 light years to 123,000 light years in diameter. It is interesting to see in this image the 'little' galaxy, ASK 577867.0, at 1.477 billion light years distant. By comparison, it spans about 263,000 light years - quite a monster. There are quite a few other background galaxies in this image - a few of which are shown in the annotated image.
Image and details can be accessed form the link below. I also provide below a link to the annotated image (for convenience) but it can also be accessed from the main image page.
Scope: Celestron 9.25 Edge 235 mm at f/7
Camera: ST8300M (Baader LRGB filters)