[vsnet-chat 5871] Re: GSC vs Tyc2

[Brian Skiff <Brian.Skiff@lowell.edu>]

>>  GSC lists standard errors on their F,J,V bands typically around 0.4mag...

     These are just the internal errors on the measurements, and don't have
anything to do with their adjustment to a standard system.
     Do note that Bill Gray has done a plate-by-plate adjustment of the
GSC magnitudes to the nearest relevant BVR passband depending on the flavor
of plate involved.  The offsets are listed at his Web site.  So local 
zero-points are already computed for the whole sky for the GSC.

\Brian

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