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

4

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)

8

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