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NGC 6546 (14,934 of 18,816)

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NGC 6546

NGC 6546, Cl Collinder 365, C 1804-233, COCD 429, h 3729, GC 4376

RA: 18h 07m 36s
Dec: −23° 20′ 0″

Con: Sagittarius
Ch: MSA:1392, U2:339, SA:22

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 21r

Mag: B=8.65, V=8

Size: 14′
PA: ?

Historical observations

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "the middle of a great and rich cluster in the milky way."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 13' and the class as 4 3 r.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "8M; 13' diameter; large and scattered; 80-plus 11M and dimmer members."

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Bright, large, rich, compressed. I counted 55 stars with a very fuzzy backround and many chains of stars at 100X."

Contemporary observations

Auke Slotegraaf

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.

Small cluster near Lagoon & Trifid nebulae. With 9.5 mag stars tonight not effortless, I carefully cross-checked the position of this cluster, and at best can call it a vague smudge bordering on three tiny stars [shown on U339]. Averted vision shows a hazy patch, but very indistinctly -- at times, I think its only the three stars and not much else.

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