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I've put this in my "Brilliant works by others" folder, because of the good colour.
Almost everyone shows Omega (and other globulars) as on average white to blue-white. But like most globulars, it's composed overwhelmingly of very old, cool (orange-red) stars with a mass less than that of the sun. A look at the colour magnitude diagram of Omega or any typical globular shows that (with the exception of a handful of blue stragglers) the brightest stars are mostly yellow to yellow-orange. The very brightest are red giants.
If one has a look at a sufficiently bright globular in a scope that's big and fast enough to collect enough light to see colour easily, it is strikingly yellow.
Showing a globular as on-average white has the excuse that one is trying to show differences. All those pretty blue globulars that folk post are just plain wrong.
So very nicely done!
Best,
Mike
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