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NGC 6507
NGC 6507, Cl Collinder 358, C 1756-174, Ocl 32.0, VIII 53, GC 4353
RA: 17h 59m 36s
Dec: −17° 24′ 0″
Con: Sagittarius
Ch: MSA:1369, U2:339, SA:15
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 43m
Mag: B=?, V=9.6
Size: 14′
PA: ?
Historical observations
William Herschel (c.1784)
Synonyms: H VIII-053
Discovered in 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of scattered small stars, 8' diameter, not very rich."
Published comments
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.
Contemporary observations
Auke Slotegraaf
1995 June 01
1995-06-01: 11x80. Kelsey Farm. 23:00 SAST. The smallest of little puffs of light. To the east of a 9th mag star, which I think is the variable star. Not a very positive sighting.
1997 April 21
1997 April 21. Jonkershoek. 11x80 tripod-mounted. No moon. Quite faint, irregular glow. Looks quite large, but very little light.
1997 July 7
1997 July 7, Monday, 21:00 - 24:00 Jonkershoek. 11x80's tripod-mounted. Star 9th magnitude seen, but no cluster.
1998 July 31
Location: Jonkershoek Nature Reserve, Assegaaibosch Station
Date: 1998 July 31 / August 01, 01:00-02:40 SAST
11x80 tripod-mounted binoculars (9.5 mag stars at times not easy)
Sky conditions: Mediocre (transp. low, seeing average, dew) The skies are showing the effects of the combination of pollution (mainly from a nearby wood-processing plant) and a stable inversion layer, turning daytime skies grey-blue, and night skies ashen.
Not found.
I noticed that the nearby 6 Sgr, to the north-east, has a reddish tinge.
BSC shows B-V +1.80 (mV = 6.3, SpectType K3III)
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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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