Sh2-86, NGC 6820, 6823, Kronberger 9 (PN) (Jim Thommes)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: NGC 6823

Sh2-86, NGC 6820, 6823, Kronberger 9 (PN)

Link: https://jthommes.com/Astro/NGC6823.htm

Sh2-86, NGC 6820, 6823, Kronberger 9 (PN)

Link: https://jthommes.com/Astro/NGC6823.htm

This image shows the region centered about Sh2-86 (also known as LBN 135) and the associated open cluster NGC 6823. This open cluster is about 7,313 light years distant (by parallax). Just to the southeast (lower left) is a small but colorful planetary nebula (Kronberger 9). To the southwest is NGC 6820 (galactic nebula) which in the past has been identified with the larger emission structure to the southwest, but more recently designated (by the NGC/IC project and others) to be the smaller bright flare nebula at the same central coordinates. Coincident with these coordinates is the very small open cluster Collinder 404. Other notable emission structures (one above and another to the right of Sh2-86) appear in a lesser known catalog as Du 28 and Du 26 (HII regions of the Northern Milky Way - R. Dubout-Crillon 1976). There are several Dark Nebula from the TGU Catalog (optical - DSS, by star count method) and the Dobashi catalog (IR Band - 2MASS sky survey). These objects and some of the brighter stars are identified in the annotated image.

Edit - A colleague pointed out to me that I had identified the planetary nebula by its central star (Lan 21). The Title and Annotation image have been corrected to the planetary designation (Kronberger 9).

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Sh2-86, NGC 6820, 6823, Kronberger 9 (PN)

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