Open Cluster NGC 6819

Object Description

NGC 6819
NGC 6819: Open cluster in Cygnus; 500 mm Cassegrain 3625 mm f/7.2; SBIG STL11K; 180+3*40 min LRGB; Bernese Highlands; © 2015 Radek Chromik [32]


NGC 6819 was discovered on 12 March 1784 by Caroline Herschel with her 4.2 inch reflector. However, her observations were not mentioned in the publications of her brother William. This is why John L. E. Dreyer knew nothing about it for his «New General Catalogue» in 1888. He indicated as discoverer Karl Ludwig Harding, who observed the star cluster in 1824. [277]

Physical Properties

NGC 6819 is a Trumpler-type I1r open star cluster with an apparent visual magnitude of about seven. The distance is estimated at about 2.4 kpc (about 7800 light years) and the age at 2.4 billion years. The metallicity is about that of the Sun and the mass of the cluster is about 2600 solar masses. [386]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Designation NGC 6819
Type OCL (I1r)
Right Ascension (J2000.0) 19h 41m 18.0s
Declination (J2000.0) +40° 11' 00"
Diameter 5 arcmin
Visual magnitude 7.3 mag
Metric Distance 2.400 kpc
Dreyer Description Cl, vL, vRi, st 11…15
Identification, Remarks h 2048; GC 4511; OCL 155

Finder Chart

Open star cluster NGC 6819 is located in the constellation of Cygnus. The best viewing time is March to December.

Finder Chart Open Cluster NGC 6819
Open Cluster NGC 6819 in constellation Cygnus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Objects Within a Radius of 15°