NGC 6940
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| SDSS recording, angle of view 28 '× 28' | |
| AladinLite | |
| Constellation | Fox |
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Position equinox : J2000.0 |
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| Right ascension | 20 h 34 m 26.7 s |
| declination | + 28 ° 16 ′ 58 ″ |
| Appearance
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| classification | III2m |
| Brightness (visual) | 6.3 mag |
| Angular expansion | 25.0 ' |
| Physical data
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| Affiliation | Milky Way |
| distance | 2500 ly (770 pc ) |
| history | |
| Discovered by | William Herschel |
| Discovery time | July 17, 1784 |
| Catalog names | |
| NGC 6940 • C 2032 + 281 • OCl 141 • Mel 232 • Cr 424 • Lund 961 • GC 4591 • H VII 8 • | |
NGC 6940 is a galactic open star cluster in the constellation Vulpecula . In the Trumpler classification it is assigned to type III 2 m or III 2 r: It is therefore a delimited cluster with no recognizable concentration, the stars are roughly evenly distributed (III); it shows a medium brightness distribution, so the stars are not all of similar brightness, but also not very differently bright (2); and it contains a medium or large number of stars (m / r). NGC 6940 has an apparent magnitude of 6.3 mag and an angular diameter of around half a degree, which roughly corresponds to the apparent diameter of the full moon.
The object was discovered on July 17, 1784 by William Herschel .