NGC 6366 (GCL 65) Globular Cluster in Ophiuchus

Located at: RA 17 hours 27 minutes 44 seconds, Dec -05 degrees 04 minutes 36 seconds

Size: 13' Magnitude: 9.5 Class: 11

North is up

West to the right


14.5" f5 Newtonian reflector


ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56


 Lumicon Red filter, 370 minutes (37 x 10 minute subs), 07/22/23/2014; seeing 2.5-4.2 per CCDStack


CCDStack 2.80.5308.25197, Photoshop CS5.1


Rolling Roof Observatory, Thousand Oaks, California 91360 (+34d 13m 29s -118h 52m 20s)


See the 8" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6366
NGC 6366
17 27 44.3 -05 04 36
V = 9.0;  Size 8.3

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 W side, the 
nearest is less than 4' from center and a closer pair of mag 11.5-12 stars [45" 
separation] is at the S 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 E 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": 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).

8": large, very diffuse, unresolved.  Located 15' E of a mag 4.5 star which 

- by Steve Gottlieb