herschel performance verification mid - term review pacs status: overview
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
1
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
HerschelPerformance Verification
Mid-Term Review
PACS Status: Overview
Markus Nielbock (MPIA)
2
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
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
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS Calibration Programme
• one proposal for each general calibration aspect
PACS Phot PACS Spec SPIRE/PACS Parallel
PVPhotSetup PVSpecSetup PVParAOTVal
PVPhotCooler PVSpecGeGa
PVPhotBol PVSpecSPU
PVPhotFPG PVSpecFPG
PVPhotSpatial PVSpecWave
PVPhotFlux PVSpecIP
PVPhotAOTVal PVSpecSpatial
PVSpecFlux
PVSpecAOTVal
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The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS Photometer Calibration
5
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS Spectrometer Calibration
6
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
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
• 4 ODs taken over from HIFI (used for pointing investigation)
• 8 ODs pointing investigation (incl. S/C STR anomaly, SAA dependence)
• 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
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS PV Phase Progress (1)
• Bottom line: PACS calibration is on track as planned.
additional investigations stretch resources for generic PACS PV to the limit
• 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
(despite the additional work)
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The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS PV Phase Progress (2)
9
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS PV Phase Progress (3)
10
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS PV Phase Progress (4)
• see presentations by A. Contursi and M. Sauvage for details
• PACS Photometer (PHOT)
• PACS Spectrometer (SPEC)
• SPIRE/PACS Parallel Mode not yet tested (first execution on ODs 111/112)
• finished detector tuning (optimal low gain/high gain bias settings)
• final bias settings, but a few issues to be clarified for detectors
• AOT validation just started (point source & scan map)
• re-design of AOTs before launch revised AOT validation programme
• AOT validation programme is being executed according to plan
11
The PACS Status
Herschel PV Mid-Term Review ESAC, September 1, 2009
PACS PV Phase Projection
• execution of assigned 18 PACS PV ODs pending
• some crucial calibration observations to be postponed until after official PV phase due to target visibility (planets, asteroids)
• two ODs (114/115) already delivered to HSC
• detailed plan exists for four following ODs (118/119, 124/125)
• mostly covering SPEC spatial calibration
• PHOT: AOT validation, spatial and flux calibration
• Jupiter: wavelength calibrator filling the entire SPEC FOV
• Neptune: flux calibrator, SPEC PSF calibrator