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Filter Wheel Closed Data

Filter Wheel Closed Data. How many EPIC CLOSED observations are needed ? Approach up to now (RCP): 12 x 10 ksec observations CLOSED FF (1/month) To be taken during the ‘good’time of the orbit New approach : 2 x 10 ksec observations (1/semester)

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Filter Wheel Closed Data

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  1. Filter Wheel Closed Data • How many EPIC CLOSED observations are needed ? • Approach up to now (RCP): • 12 x 10 ksec observations CLOSED FF (1/month) • To be taken during the ‘good’time of the orbit • New approach: • 2 x 10 ksec observations (1/semester) • Should there be evidence of response inhomogeneities, this can be increased • via NRCOs or by changing the RCP • Additionally, during some slews, all the MOS cameras can be set to CLOSED FF

  2. Implementation of MOS Slew CLOSED Data: • Operations • There are no operational issues and it can be easily implemented • The Slew mode can be specified in the R&C File • Implementation • Two R&C Files are prepared • R&C1: All MOS FF CAL-CLOSED Slews (Default) ; PN used for Slew Survey • R&C2: All MOS FF CLOSED Slews ; PN used for Slew Survey • All Slews in any given revolution will be done according to either R&C1 or R&C2 • The selection of a given R&C file is done by hand by the mission planner at the time the • revolution is scheduled • The selection of R&C1 or R&C2 is manual (best-effort-basis) • The re-schedule of a revolution because of a trigger or ToO observation could • change the initially selected R&C File (picking the wrong file) • Considerations • Slews are kept to a minimum, i.e., the average Slew duration is around 45 min (7.5 ksec at best) • The duration of the Slews will not be considered by the mission planner when using R&C2

  3. Discussion : • MOS : Do CLOSED in Slews and/or dedicated observations ? • MOS : How often, i.e, how many revolutions should MOS be set to CLOSED during Slews ? • MOS : Does using MOS in CLOSED every so often have any impact in the MOS CAL-CLOSED • Slews ? • PN : is the approach of 2x10 ksec ok ?

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