NGC6820 Nebula doesn’t have a name, so let’s call it Hidden octopus nebula (because only one tentacle is visible). Hidden octopus nebula is a giant cloud (50 light years in diameter) of ionized hydrogen alpha gas, where new stars are born. The tentacle forms similar structure just like in more famous M16 Eagle nebula. It’s located in constellation Vulpecula (Little fox) not far from M27 Dumbbell nebula and it’s 6000 light year from Earth.
The picture was processed in bi-color technique. This means: two narrow band pictures, one H alpha and OIII. H alpha inserted into the red channel, OIII into the green and blue one.