fox1 on 04-Nov-2015 09:02:58 GMT about The GSC 2.2 Catalogue (STScI, 2001)
Well, the column "Epoch" contains the mean epoch of the position, which would be the date of observation if only one observation has been made (the source is present on a single plate). Several observations being made for each source, the "Epoch" column is the mean of the different dates of observations.
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View annotation on catalogue I/271