What is this diffuse spot close to Regulus, the main star in constellation Leo? These thoughts were not pondered by a famous discoverer but by myself while looking for deep sky object around constellation Leo worthwhile for a longer shooting session. I used the planetarium software Stellarium at that time. And the faint spot had never come across to me as a prominent object until that moment. There was no special catalogue identifier or label visible although the object appeared to be extended and not too dim.