NGC 6939

open cluster in Cepheus

Key facts

Right ascension: 20 31 30
Declination: +60 ° 39 ′ 42 ″
Distance: 3,860 ly (1,185 pc )
Apparent dimensions v: 7'
Estimated age: 2.2 billion years
Other designations: Melotte 231
Constellation: Cepheus

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Wikidata facts

Instance of: open cluster
Part of: Milky Way
Constellation: Cepheus
Distance from Earth: 1.8
Image: NGC 6939.png

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catalog code: [KPS2012] MWSC 3357
Commons category: NGC 6939
discoverer or inventor: William Herschel
time of discovery or invention: 1798-09-09
apparent magnitude: 7.8
right ascension: 307.8750
declination: 60.6617
epoch: J2000.0
radial velocity: -42.0
metallicity: 0.03
right ascension component of proper motion: 0.86
declination component of proper motion: -2.16

Sources (1)

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Encyclopedic overview

NGC 6939 is an open cluster in the constellation Cepheus. It was discovered by William Herschel in 1798. The cluster lies 2/3° northwest from the spiral galaxy NGC 6946. The cluster lies approximately 4,000 light years away and it is over a billion years old.

Observation

Excerpted from Wikipedia’s “NGC 6939” article, available under the CC BY-SA 4.0 licence.

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