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I believe it is straylight from an outside source. Could be anything from a streetlight that happened to shine in your tube, to a meteor bright enough to cause internal reflections in your optics that whisked past close to M30 during your exposure.
Les makes an interesting point about Jupiter, but at 8º distance, that's probably a bit too distant for an object of that brightness to interfere, especially as drastically as it did in your image.
The waxing gibbious moon was in Scorpious on the date of your image, so it perhaps could be the culprit?
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