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XMM-Newton Science Analysis System


omsrclistcomb (omsrclistcomb-2.11.4) [xmmsas_20080701_1801-8.0.0]

Meta Index / Home Page / Astrometric correction

Unsuccessful Astrometry Correction

If the conditions for a successful astrometry correction (as defined in the previous section) have not been met, then the keywordPOSCORROK in the SRCLIST table will be set to F (False) and the columns RA_CORR and DEC_CORR will be set equal to the uncorrected values.

The key-words RAOFFSET, RAOFFERR, DEOFFSET, DEOFFERR, ROT_CORR, ROT_ERR, NMATCHES, RMSRESID will again contain the computed RA offset, RA offset error, DEC offset, DEC offset error, rotation, rotation error, the number of sources used in the astrometric fit and the root-mean-square residual of the fit, respectively.