0004576768



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AORKEY = 4576768

PI = James R. Houck
PROGID = 74
PROTITLE = Powerful Radio Sources
OBJECT = 3C220.3
PKUPACCU = Moderate
PKUPFILT = BLUE
PKUPFLUX = 1.00000
PKUPXTND = 0
PTGDIFF (ACQ) = 3.1366294
PTGDIFF (SS) = 31.110100
ACQ XC = 9213
ACQ YC = 3909
SS XC = 10732
SS YC = 2805

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EXPLANATION

There is a source in the field brighter than the intended target. That other source was selected by the onboard PU and moved to the slit.