One of the things we like to brag about with astrometry.net is that it can be used to recover data that have been lost or badly archived (that is, have been tagged with incorrect meta-data). We recovered SDSS run 2301, which is an engineering run of no particular import except that the astrometry for the run was never correctly determined (probably because the telescope was confused about where it was pointed at the start of the run). Today, some SDSS collaborators contacted me about SDSS run 6895, which goes through globular cluster M71. I spent the few research minutes I got today trying to massage the data into astrometry.net.
Note added next morning: When I got the first field of the SDSS data into JPEG form and got it into the system, it solved fast, and our system even said that the field contains M71.
Red stars are our object-detections and green stars are in the USNO-B. M71 is in the upper right corner.
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