CHAR-TEL-003: External straylight levels¶
Parent requirement¶
Objective¶
During commissioning it was discovered that sunlight can enter the instrument cavity through a triple scattering chain, beginning with a thruster nozzle. Straylight levels are largely removed by rotation the spacecraft such that the nozzle moves into the shadow. This characterisation obtains the strailight levels at various AA and SAA angles for both the VIS and NISP instruments, and thus defines a dark AA/SAA subspace that can be used by EC-SURV to build a compliant survey.
Cadence¶
Once, during PV.
Observations¶
Methodology / Uplink procedure¶
Targets and pointing constraints¶
Instrument configuration¶
Inter-operability constraints¶
Dependencies¶
Fulfilling¶
Fulfilled by¶
Time-critical¶
Yes. Must be obtained as soon as possible in PV.
Validation¶
Recovery¶
In-orbit duration¶
Processing time¶
Processing input¶
Ground Processing Input Data:
Data Description:
Data volume¶
Processing tools¶
Processing element¶
DataModel: https://gitlab.euclid-sgs.uk/
Quality control parameters¶
DataModel: https://gitlab.euclid-sgs.uk/
Required accuracy, constraints¶
Processing method¶
Processing output¶
Mean background levels per detector in the VIS and NISP FPAs.
Contact person¶
Calibration Lead
Status¶
2026/09/18 - In progress.
Comments¶