NGC/IC Project Restoration Effort

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NGC6366

 

Basic Information


Location and Magnitude


Right Ascension: 17:27:44.3
Declination: -5:4:34
Constellation: OPH
Visual Magnitude: 9.5

Historic Information


Discoverer: Winnecke
Year of discovery: 1860
Discovery aperture: 3.0

Observational


Summary description: F, L, vlbM (Auw 36)
Sub-type: XI

Steve's Notes

===== NGC 6366 18" (7/26/06): at 325x, 30-35 stars can be resolved with careful viewing in a 4' region with roughly two dozen of these generally visible and another dozen sparkling in and out of visibility. The resolved stars seem spread out over the entire disc, which is only weakly concentrated. The outline of the halo is quite irregular and ill-defined and may reach to a larger extent than 4'. Several brighter stars, which are clearly not part of the cluster, are around the border. Located just 17' E of mag 4.5 47 Ophiuchi. Faintly visible in 15x50 IS binoculars. 17.5" (7/20/98): at 220x appears as a diffuse irregular glow, ~4' diameter, with only a weak concentration. Two mag 9 and 10 stars are off the west side, the nearest is less than 4' from center and a closer pair of mag 11.5-12 stars [45" separation] is at the south edge. There are perhaps a half dozen faint but obvious stars visible over the ill-defined glow including a couple of mag 14 stars 2' S of center, one a similar distance east of center and an addition pair on the SE side. About a dozen stars are visible with careful viewing. At 280x, the cluster is pretty clumpy and starting to really break up into numerous very faint stars. Roughly two dozen stars can be glimpsed with averted vision, many near the threshold of visibility. The full extent of the cluster is difficult to trace but extends beyond the central 4' region. 13.1" (7/5/83): large, diffuse, very weak concentration. About a dozen faint stars are resolved over a hazy background. Located 17' E of 47 Ophiuchi (V = 4.5). 13.1" (6/19/82): few faint stars resolved over a large, hazy region. 8" (6/27/81 and 5/21/82): large, very diffuse, unresolved. Located 15' E of a mag 4.5 star that detracts from viewing.