And finally, while you'll see lots of references that state the Soul Nebula is IC 1848, that designation belongs to an open cluster within the nebula. Both of these objects each span 1°, but ...

Crab Nebula has been constantly observed by Chandra ... The mosaic of the Heart and Soul nebulae is located about 6,000 light-years from Earth. The nebulae is a part of a vast star-forming complex ...