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20 Vulpeculae Cluster
NGC 6885, Cl Collinder 417, C 2009+263, Ocl 132.0, Caldwell 37, 20 Vulpeculae Cluster, VIII 20, h 2071, GC 4559
RA: 20h 12m 0s
Dec: +26° 29′ 0″
Con: Vulpecula
Ch: MSA:1194, U2:163, SA:9
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 32m
Mag: B=8.71, V=8.1
Size: 20′
PA: ?
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 6885 is probably also NGC 6882, which see.
Historical observations
William Herschel (c.1784)
Synonyms: H VIII-020
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of coarsely scattered stars, not rich."
Published comments
Trumpler, R.J. (1928)
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 22' and the class as 3 2 p. He notes: "In the region around 20 Vulpeculae two clusterings seem to be superposed. A loose clustering of 20-30 mostly faint stars, about 8' in diameter was identified with NGC 6882. The coarse group of a few bright stars clustered around 20 Vul, with a diameter of about 22' was identified with NGC 6885. In each of the two clusters a physical relationship of the stars is indicated by the magnitude spectral class diagram, but the two clusters are evidently at different distances."
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.0 mag open cluster.
Modern observations
Walter Scott Houston
Houston notes that this is a sprawling group of some 15 stars of 9-10th mag, surrounding 6th mag 20 Vulpeculae. With apertures of 3 to 6 inches it is an interesting low-power object. In 1978 he called it an "object worthy of study. Within a 20' diameter patch of sky are nearly twoscore 9th and 10th mag stars. At the southeast edge of the cluster is the naked eye 20 Vul. The cluster will show in binoculars, and is an interesting sight in a 6-inch. It appears to be associated with NGC 6882, only 4' north."
Tom Lorenzin
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "7M; 15' diameter; large and medium rich; 35-plus 6 thru 11M members; includes 6M star 20 VUL; cluster N6882 (8M; 18' diameter;) 20-plus 10M and dimmer members just N; 19 VUL is brightest member."
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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