NGC/IC Project Restoration Effort

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NGC6218

 

Basic Information


Location and Magnitude


Right Ascension: 16:47:14.5
Declination: -1:56:50
Constellation: OPH
Visual Magnitude: 6.1

Historic Information


Discoverer: Messier
Year of discovery: 1764
Discovery aperture: 3.5

Observational


Summary description: !! globular, vB, vL, iR, gmbM, rrr, st 10…
Sub-type: IX

Steve's Notes

===== NGC 6218 18" (7/11/07): at 325x this globular nearly fills the field and extends roughly 11' in diameter. Contains a very bright 3.5'x2.5' oval core, extended WNW-ESE. A mag 10 star with an orange tint is just south of the core, 2' from the center. Two other mag 10-11 stars lie 4' N and 5' ENE of center in the halo. The core is plastered with an immense number of mag 12.5-13.5 stars and in the central 2' is an incredibly dense mat of mag 13.5 and fainter stars. Very irregular sprays of stars emanate from the central region and form part of the very scraggly outer halo. 17.5" (7/15/99): at 220x this bright cluster is highly resolved over the entire disc. Appears smaller than M10, perhaps 11'-12' diameter with a fairly well-defined 3.5' core. Two bright field stars are embedded in the north edge of the halo and a third bright star is off the following end. A mag 10 star is also superimposed just off the SE edge of the core. A number of brighter resolved mag 12 stars appear to be grouped into pairs and trios. There are a couple of hundred fainter stars in the central 8' over unresolved haze. The outline is very irregular and there are distinctive star-poor areas in the outer halo. 13.1" (6/19/82) : bright, large, round, very intense core with faint stars scattered over the core. The outer halo is highly resolved into scores of stars. Slightly inferior to M10 in faint stars. 8": the outer halo is well resolved and partial resolution of the core. There are two or three brighter stars in the outer halo.