RISA Application

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 goodtime 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 RC File
• Implementation
• Two RC Files are prepared
• RC1 All MOS FF CAL-CLOSED Slews (Default) PN
  used for Slew Survey
• RC2 All MOS FF CLOSED Slews PN used for Slew
  Survey
• All Slews in any given revolution will be done
  according to either RC1 or RC2
• The selection of a given RC file is done by
  hand by the mission planner at the time the
• revolution is scheduled
• The selection of RC1 or RC2 is manual
  (best-effort-basis)
• The re-schedule of a revolution because of a
  trigger or ToO observation could
• change the initially selected RC File
  (picking the wrong file)

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 ?