XMM-Newton Science Analysis System
omichain (omichain-1.45.14) [xmmsas_20050815_1803-6.5.0]
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Future developments
Presently, the tabulated source positions suffer from an unknown offset in RA
and declination, which could be up to 10 arcsecs or more. The program
omatt, which calculates the equatorial coordinates of the sources, can in fact
calculate these offsets and correct the positions, but only if it has access
to a star catalogue. Unfortunately, at present no catalogue is available and
hence no correction can be applied. It is expected that in the near future a
catalogue will be provided with each ODF set, enabling an astrometric
correction to be made.
XMM-Newton SOC/SSC -- 2005-08-16