*************************************************************
AORKEY = 10197504
PI = Charles Woodward
PROGID = 2316
PROTITLE = The Astromineralogy of Solar System Comets
OBJECT = Helin-Roman-Crockett
PKUPACCU = Moderate
PKUPFILT = RED
PKUPFLUX = 160.800
PKUPXTND = 1
PTGDIFF (ACQ) = 112.38604
PTGDIFF (SS) = 115.95319
ACQ XC = 0
ACQ YC = 0
SS XC = 0
SS YC = 0
*************************************************************
EXPLANATION
The predicted flux of the PU target is 160 mJy, but the only source
in the field (which is not at the aim point) is 1-2 orders of magnitude
fainter. As a result, the onboard PU algorithm was not able to find a
valid centroid and generated a NO_CENTROID alarm. No source was in the
slit for the spectrum.