SPIRE Design Description - Research Services

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Draft SPIRE Design Description Document Launch latch position indicator: This is a micro switch that indicates the state of the launch lock. The contact on the switch can only be closed when the Shutter has returned to the open position and the launch lock successfully deployed. Shutter in open position Wall of FPU Inlet optical filter Light entering SPIRE 114 Stray light baffle Upper surface of shutter (low emissivity) Shutter in closed position Lower surface of shutter (high emissivity) Figure 4-56 - Physical layout of shutter within the inlet of the FPU enclosure. The powering, thermal control and the monitoring of the shutter sub-system are all carried out with the EGSE. When the EGSE is disconnected, the shutter is unable to be operated or controlled. The state of the launch lock indicator must be read out by the spacecraft housekeeping electronics.
Draft SPIRE Design Description Document 5. INSTRUMENT OPERATING MODES The operational modes of the SPIRE instrument are documented in detail in the OMD. These operating modes can be summarised as being the sequence adopted to turn the instrument on, preparing it for scientific observations, making the observations, the recycling of the cryogenic cooler and the abnormal and normal shut down. The implementation of the astronomical observing modes will be briefly described here. 5.1 Spacecraft pointing It is assumed that SPIRE pointing will be defined with respect to the telescope boresight by two offset positions, one for the centre of the photometer arrays and one for the centre of the spectrometer arrays, as shown below. When the telescope is pointed at a source at the request of SPIRE, it shall be aligned on one of the two positions defined in Figure 5-1 below. Any offsetting by the SPIRE BSM or the AOCS shall then be defined with respect to this position. θ Z Centre of Herschel focal plane θ Y 115 Centre of photometer fov Coordinates:(θ YP =0º, θ ZP =0º10’59”) Centre of Spectrometer fov Coordinates: (θ YS = 0º7’23”, θ ZS=0º10’59”) Figure 5-1 - Definition of SPIRE pointing offsets with respect to the telescope boresight. 5.2 Spacecraft movements during SPIRE observing The Herschel spacecraft is capable of executing various controlled movements to allow observations of various kinds by the three instruments. These are described in detail in the IID-A. SPIRE will mainly use the following spacecraft movements.
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