Imaging Simeis 57 with my RASA, I found a small nebula in the left lower corner which I cannot identify - have you guys an idea what this might be?

I have added the entire FOV and the detail in the left lower corner

Thanks and CS
Georg

📷 Propellernebula.jpgPropellernebula.jpg

📷 FaintNebulaDetail.jpgFaintNebulaDetail.jpg