Finally, got to have a look at the globular cluster pair NGC 6522 and NGC 6528, Vmags 8.3 and 9.6. The two globulars are about the same size and can be seen in the same FOV as the star gamma Sagittarii, Vmag 3. They have the distinction of being the only two brighter globular clusters that can be seen in the same FOV as a bright star.
They are 16.5 minutes apart. NGC 6522 is 37 minutes from gamma Sgr, while NGC 6528 is 25 minutes from gamma Sgr.
Thanks to Les D (ngcles) for this pair.
Also nearby are the globular pair NGC 6569 and NGC 6558, Vmags 8.6 and 9.3. Again they are both in the same FOV, being 43 minutes apart. NGC 6569 is fairly bright but NGC 6558 is quite dim at nearly twice the size. They are located between gamma and epsilon Sgr with NGC 6569 just 8.5 minutes from the Vmag 6.8 star HD 166790.
Also worth a look are globulars NGC 6638, Vmag 9 and M28, Vmag 7.7. They are on opposite sides of lambda Sgr. NGC 6638 is 40 minutes from lambda while M28 is 57 minutes from the star.
Worth a look if you haven't seen them before.
Regards, Rob.
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