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.

Technical Details

LocationZollikerberg, Switzerland
CameraNikon DSLR D810A
TelescopeTS ONTC 12" f/4 Carbon Newton
OpticsTS 2,5" Wynne Coma Corrector
Focal Length1126mm
MountiOptron CEM60 Center-Balanced Equatorial Mount
AutoguidingLacerta MGEN2 (Autoguiding, Dithering)
Planetarium SoftwareStellarium
Image Session ControlAPT - Astro Photography Tool v3.5, ASCOM Platform 6
Lights40/78 x 120s (total 3h56'), ISO-1600, additional Biases, Flats, no Darks
Stacking SoftwarePixinsight 1.8, Drizzle 2x
Image ProcessingPixinsight 1.8