Jump to the updates of 19 Aug 2008
Jump to the updates of 20 Nov 2007
Pointing and live time history (FT2, LS-005)
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I don't see any downside to including attitude quaternions, other than increased sizes for FT2 file, but I'm likewise not sure whether I see any big advantages either.
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Here are additional items added on 19 August 2008
7. Rocking angle of the LAT
(Digel) The rocking angle of the LAT (i.e., the direction of the LAT z axis from the zenith) is not used directly by the Science Tools but it is of interest for evaluating the observing strategy and especially for assessing albedo backgrounds and loss of exposure for pointed observations. It can be derived from the direction of the LAT z axis and the zenith direction, but having it directly in the FT2 file would be more convenient.
8. Direction of the orbital pole
(Digel) Similarly, this information is not used in the Science Tools but having it conveniently available would be useful for evaluating observing strategies. The direction of the orbital pole can be derived from information already in the FT2 file but it requires, e.g., calculating cross products of zenith directions in successive time steps. Having the direction of, say, the northern orbital pole directly available in the file would be a convenience; the impact would be the addition of 2 floating-point columns. Also ft2Util would need to be updated. No existing FT2 file would 'break' as the result of this change.