Good research there, Akarsh. I've seen NGC 253 naked-eye and hopefully, am not the only one on this forum to have done so! I've tried for the globular cluster [LA83] NGC 253 35 (+17.58b) once with my friend's 36-inch and failed.

NGC 253 Brightest Confirmed GC.jpg

However, I did end up seeing some sort of star-forming region and/or OB association with that same telescope on the same night without distinctly looking for it in the northern half of the galaxy.

combined.jpg

NGC 253 SFR.jpg
Hubble ASC image

In the image below, I've marked where the "bright blob" (a comical choice since it's truly fainter than everything right around it!) from my reading of the Watson et al (1996) paper. So, please tell me you didn't put the red cross-hairs on the image you included the caption "HST V-band (F555W) image of the region around the "bright blob" [9]"!

opo9510a.jpg

Scott H.