Corrections to USNO-B plates from PPMX

This table contains, for each field that went into USNO-B1, a correction derived from matching the USNO-B1 positions for that plate with the PPMX ones (used as a representation of ICRS) and deriving a mean offset of the objects from that particular plate for them. We did not attempt to derive magnitude-dependent corrections (although it is known that the true residuals depend on both magnitude and color).
No selection matches all, multiple values legal.
Survey identifier, see long docs
Field number in survey
Number of objects in estimate
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This service uses code provided by Astrometry.net. For more details visit http://astrometry.net. The field metadata were, in part, taken from CDS' Vizier service.