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🌎 Location: Greenwich, United Kingdom [change]

NGC 6939 - Open Cluster

NGC 6939 is a Open Cluster in the Cepheus constellation. NGC 6939 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere.

NGC 6939
Open Cluster
  • NGC 6939 is above the horizon from Greenwich, United Kingdom [change]. Its current altitude is 29° above the horizon. See also rise and set times.
  • Given its visual magnitude of 7.8, NGC 6939 is visible with the help of a binocular with a 40-50mm aperture or a small telescope.
Available Resources for NGC 6939 - Open Cluster

Photometric information of NGC 6939

The following table lists the magnitude of NGC 6939 in different bands of the electomagnetic spectrum (when available), from the B band (445nm wavelength, corresponding to the Blue color), to the V band ( 551nm wavelength, corresponding to Green/Yellow color), to the J, H, K bands (corresponding to 1220nm, 1630nm, 2190nm wavelengths respectively, which are colors not visible to the human eye).


For more information about photometry in astronomy, check the photometric system article on Wikipedia.

Apparent size of NGC 6939

The following table reports NGC 6939 apparent angular size. The green area displayed on top of the DSS2 image of NGC 6939 is a visual representation of it.
12 arcmin
12 arcmin

Digitized Sky Survey image of NGC 6939

The image below is a photograph of NGC 6939 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.4x0.4 degrees (24x24 arcmins).

Image of NGC 6939 - Open Cluster star
DSS2 image of NGC 6939 in the Red band. The green region on the image is a representation of the major (12 arcmin) and minor (12 arcmin) axes of the object's apparent size.

Celestial coordinates and finder chart of NGC 6939

Celestial coordinates for the J2000 equinox of NGC 6939 are provided in the following table:

20h 31m 29s
+60° 39’ 43”

The simplified sky charts below show the position of NGC 6939 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

Finder chart NGC 6939 - Open Cluster star
Simplified finder chart for NGC 6939 - Open Cluster.

Finder chart NGC 6939 - Open Cluster star
Simplified finder chart for NGC 6939 - Open Cluster.

Rise ans set times of NGC 6939 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

NGC 6939 - Open Cluster is circumpolar and transits at 12:34 UTC (altitude: 80.8°)