NGC 6939

open cluster in Cepheus

In the Vinony graph

Vinony's link graph records 404 inbound references to NGC 6939, and connects out to Lagoon Nebula, North America Nebula and NGC 6751.

It sits within the topics Astronomical objects discovered in 1798, Cepheus (constellation) and Discoveries by William Herschel.

Vinony links it to 30 Wikipedia language editions.

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

via Wikipedia infobox

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)

wikidata.org

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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.