Interspersed between NSF proposal paragraphs, I followed up some failure fields in our blind astrometry demo project (in which we throw away all the astrometry information for every SDSS field, randomize their order, and solve them all again, totally blind). Almost all of the failures can be attributed to holes in the USNO-B1.0 catalog (not our problem), I believe, but for those few failures that can't, some are bad SDSS data where, eg, the telescope jumped or fell out of focus. Even these are very rare: Our success rate is more than 99.8 percent.
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