... Meta Index / Home Page This section documents warnings and errors generated by this task (if any). ... The value of the INSTRUME keyword of the event list was not one of the XMM EPIC instruments. noSourcesSelected . ... None of the sources in the input event list passed the filter specified by expression . ... The present error occurs if any value of the integer specified in this column occurs more than once (in the filtered source list). badIdBand . ... The task couldn't work out the source energy....

... Astrometry with the FGS, by contrast, proceeds in the reverse order; the positions of the individual objects are found first, and then a virtual plate is constructed with the help of data from the guide stars and check stars. ... Corrections based on guide star data are referred to as POSITION mode dejittering , and those based on check star data are called drift corrections . ... The adjustments to the astrometry centroids from this POSITION mode dejittering correction are typically about 1 mas. ...

Program: PATCH Purpose: Find data values at positions of blanks interpolating the data in a small volume around the blanks. ... 1.0] OUTSET= Set to write the output to. [input set] BOX= Area to replace blanks. For all subsets the same box is used. ... If ALL=y, however, PATCH fits only one polynomial, centered on the position supplied at BOX=, but substitutes all blanks inside the area specified by SIZE= --also used to collect the data-- by the values of the polynomial. ...

... the computed pointing error for different vertical offsets (.ps) ( .pdf ): . the measured platform height offset and pointing error (.ps) (.pdf ): . ... This gave us a dataset of a pointing run with simultaneous info on the vertical error in the platform position The plots show the measured platform height offset and pointing error (.ps) (.pdf ): . ... The pointed error computed from the height offset matches the measured za error offsets when the platform is offset in height. ...

... The HST uses an onboard model of its orbit to perform in real-time various control functions relating to spacecraft operations and observation support. ... New coefficients for the ephemeris are updated every other day, and are archived as FITS keywords for each HST observation data set. Using these coefficients,an observer can perform a variety of calibration and characterization calculations relating to the orbital position and velocity of the telescope. ...

... An error involving a missing tasks parameter indicates that the parameter file may have changed between the last time the task was used and the current version. ... If still in trouble, delete the parameter file in `myiraf/uparm' corresponding to the task (the names are somewhat contrived, but with a bit of imagination it is not too difficult to identify the right one). ... The imcnts task and region masks . ... A region descriptor of the kind: . CIRCLE(403, 403, 22.5) . ... See `help regions'.) ...