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GCL 65
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NGC 6366 (also GCL 65) is a magnitude +9.5 globular cluster located 11,700 away in the constellation Ophiuchus, and about 16,300 light-years from the galactic center.
The cluster can be observed just over 3 degrees south-west of Messier 14 and 1/2 degree east of the star 47 Ophiuchi.
The cluster is visible with medium-sized telescopes; although the brightest star in the cluster is only of magnitude +13.6. 

The cluster was discovered by the German astronomer Friedrich August Theodor Winnecke using a 7.62 cm (3-inch) refracting telescope at the Pulkovo Observatory on the 12th April 1860. 

Right ascension 17h 27m 44.2s, Declination 05° 04 47



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Posts: 130165
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NGC 6366
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Title: Panchromatic fits to the Globular Cluster NGC 6366
Authors: Fabíola Campos, S. O. Kepler, C. Bonatto

We present panchromatic isochrone fits to the colour magnitude data of the globular cluster NGC 6366, based on HST ACS/WFC and SOAR photometric data. Before performing the isochrone fits, we corrected the photometric data for differential reddening and calculated the mean ridge line of the colour magnitude diagrams. We compared the isochrones of Dartmouth Stellar Evolution Database and PAdova and TRieste Stellar Evolution Code (with microscopic diffusion starting on the main sequence). Based on previous determinations of the metallicity of this cluster we test it from [Fe/H]=-1.00 to [Fe/H]= -0.50, and the age from 9 to 13 Gyrs. The uncertainties do not decrease when we fit simultaneous colours. We also find that the Dartmouth Stellar Evolution Database isochrones have a better fit in the sub giant branch and low main sequence than the PAdova and TRieste Stellar Evolution Code. Considering the most recent spectroscopic determination of the metallicity ([Fe/H]= -0.67), we find E(B-V)=0.69±0.02, (m-M)_V=15.02±0.07 and 11±2 Gyr for NGC 6366.

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