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As a comparison, the Catalina Sky Survey V-band light curve:
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Select mean objects and associated detections within 3 deg of HDF; compare photometry and astrometry with Gaia DR2
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The same region of the sky contains 86,685 Gaia DR2 sources, of which 77448 have a valid five-parameter astrometric solution, and 68638 have also a valid G magnitude. For the first matching stage, we do not require valid magnitude or five-parameter astrometry; the direct positional match with a generous 10" radius finds 82,398 matches, with the vast majority well within 1":
ExtendedFlag = (qualityFlag AND 1)
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