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Lacaille I.11 (15,159 of 18,816)

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Lacaille I.11

Lacaille I.11, NGC 6634, GC 5076

RA: 18h 29m 55.3s
Dec: −33° 30′ 40″

Con: Sagittarius
Ch: MSA:1436, U2:378, SA:22

Ref: [1755MmARS..??..194L ], Cozens PhD 2008

(reference key)

Type: asterism

Mag: B=?, V=8

Size: ?
PA: ?

Remarks

NGC 6634 = Lac I.11, an asterism; NGC 6637 is the globular cluster Messier 69.

Historical observations

Lacaille (1755)

This entry was recorded by Lacaille while visiting Cape Town and included in his 1755 catalogue as Class I No. 11. His description: "It resembles a small nucleus of a faint comet." was recorded using a half-an-inch 8x telescope.

Lacaille's position for this object is 18h 30m 02s,3332'08" (J2000.0). This position falls within an isosceles trapezium (5 arcminutes) of four stars V= 8.0-9.3, the brightest of which is HD 170280 (SAO 210234; V=8.0; 18h 30m 02.1s,-3329'43").

Wolfgang Steinicke (Historic NGC 2009) list the position for Lac I.11 as the approximate centre of this trapezium and classifies it as "*Grp".

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NF S.

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