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XMM-Newton Science Analysis System


orbit (orbit-2.9) [xmmsas_20080701_1801-8.0.0]

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Future developments

Currently, the OAL only returns the x-y-z positional coordinates from the orbit file. It is important for this to be expanded to also include the velocity vectors. The ESOC ICD XSCS Orbit Access Software document [3] describes other parameters users might eventually find useful to access in FITS format and may be included in later versions of this task as keywords.

It might be useful to arrange the output files to conform to a known standard, such as the XTE Orbit File, which are not only already OGIP- compliant, but would allow these files to take advantage of FTOOLS designed to read such formats. This can be accomplished with a slight expansion of the OAL_getPosition routine.

The OAL first attempts to extract the RECONSTRUCTED orbit file to fill the output file, and failing that, will extract the PREDICTED orbit file. It may be useful in the future to have a switch allowing the extraction of EITHER, chosen by the user.