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I spent best part of an hour looking for NGC 6380 2 nights ago in good conditions, with my 12" scope, but failed. I used the 4 star asterism as a guide, so I know I was in the right area. I also dipped out on globular cluster Tonanzintla 2, which is close to NGC 6380, close to star HD 6546. I'll try again when the conditions are good.
These globulars close to the galactic plane are often difficult, but the biscuit must go to 2MASS-GC01 , about a degree west of Mu Sagittarius, Uranometria map 145. The literature gives the visual magnitude as +27.7 - just a tad beyond my capacity.
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