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Herschel Performance Verification Mid - Term Review PACS Status: Overview

Herschel Performance Verification Mid - Term Review PACS Status: Overview. Markus Nielbock (MPIA). PACS PV Phase Plan. Goals and details of PACS PV outlined in PACS PV Phase Plan Document (PICC-MA-PL-001, Issue 1.4). description of calibration sources.

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Herschel Performance Verification Mid - Term Review PACS Status: Overview

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  1. Herschel Performance Verification Mid-Term Review PACS Status: Overview Markus Nielbock (MPIA)

  2. PACS PV Phase Plan • Goals and details of PACS PV outlined in PACS PV Phase Plan Document • (PICC-MA-PL-001, Issue 1.4) • description of calibration sources • high level description of calibration programmes • detailed description of calibration observations • overview of pipeline processing • high level plan of PACS PV phase OD schedules • trace matrix of scheduled ODs and targets per calibration item • MTL (mission timeline) overview of scheduled PACS ODs • main drivers of AOT validation: • requirements and AOT requests of GT/OT Key Projects • reproducibility of AOT mode results (cross calibration) • optimise AOTs wrt their parameter space probed

  3. PACS Calibration Programme • one proposal for each general calibration aspect

  4. PACS Photometer Calibration

  5. PACS Spectrometer Calibration

  6. PACS PV Phase Statistics • today: OD 111 (SPIRE/PACS Parallel) • start of PV phase: OD 64 48 days of PV, 25 days covered by PACS • 8 ODs pointing investigation (incl. S/C STR anomaly, SAA dependence) • 4 ODs taken over from HIFI (used for pointing investigation) • could not be used for advancing PACS calibration programme • some observations (a few ODs in total) have failed • technical reasons like STR1/STR2 swap • SAA dependent PTG performance • human error (CUS code, AOR parameters) • none of the failures put instrument or S/C in danger

  7. PACS PV Phase Progress (1) • turnaround cycle: observation – analysis – planning – scheduling – delivery • 12 days (PACS alternating PHOT/SPEC  PACS prime every 6th OD) • originally: 2 days downlink – 8 days analysis – 2 days uplink • changed to: 2 days downlink – 5 days analysis – 5 days uplink • PACS stepping in for HIFI increases work load for planning, uplink, analysis • additional investigations stretch resources for generic PACS PV to the limit • Bottom line:PACS calibration is on track as planned. (despite the additional work)

  8. PACS PV Phase Progress (2)

  9. PACS PV Phase Progress (3)

  10. PACS PV Phase Progress (4) • see presentations by A. Contursi and M. Sauvage for details • PACS Photometer (PHOT) • finished detector tuning (optimal low gain/high gain bias settings) • AOT validation just started (point source & scan map) • PACS Spectrometer (SPEC) • final bias settings, but a few issues to be clarified for detectors • re-design of AOTs before launch  revised AOT validation programme • AOT validation programme is being executed according to plan • SPIRE/PACS Parallel Mode not yet tested (first execution on ODs 111/112)

  11. PACS PV Phase Projection • execution of assigned 18 PACS PV ODs pending • two ODs (114/115) already delivered to HSC • mostly covering SPEC spatial calibration • detailed plan exists for four following ODs (118/119, 124/125) • PHOT: AOT validation, spatial and flux calibration • some crucial calibration observations to be postponed until after official • PV phase due to target visibility (planets, asteroids) • Jupiter: wavelength calibrator filling the entire SPEC FOV • Neptune: flux calibrator, SPEC PSF calibrator

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