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We have used images from the FOCA balloon borne middle UV imaging telescope as a test of the optical - ultraviolet identification abilities of the proposed Joint Ultraviolet Nightsky Observer mission (JUNO). The precision of the FOCA object centering is 3'' and the resolution (FWHM) is 12''; as such optical identification is required for meaningful source identifications. The magnitude range we are examining extends to 18 in the UV which corresponds to a required visible magnitude limit of 22. The only sources of all-sky optical coverage at this magnitude limit are the Palomar and UK/ESO surveys. We have therefore made use of the Guide Star Plate Archive to both optically identify the UV sources and provide basic color and proper motion information on those images.
This application of all-sky surveys is an obvious and increasingly important use of such datasets. We present preliminary results and discuss the problems encountered.
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