2019-09-19/20 / Click on image to enlarge
NGC 6820 is an emission nebula that surrounds open cluster NGC 6823 in Vulpecula. The nebula has been discovered by the German astronomer Albert Marth in 1864. The open cluster NGC6823 was previously discovered by William Herschel in 1785. NGC6820 lies about 6000 light years away.
The center of the open cluster is about two million years old and is predominantly represented by many young, bright blue stars. The most striking feature is the trunk-like pillars of dust and gas in the outer parts of the cluster. They are probably formed when surrounding gas and dust is pushed and eroded away by radiation from nearby stars. Remarkable dark globules of gas and dust are also visible in the nebula, much as is seen in the better known Eagle Nebula in Serpens.