Bruno Altieri Jan # 1 Pointing calibration plan Bruno Altieri (HSC) PACS PV phase review MPE, January 2008

Bruno Altieri Jan # 2 Pointing Working Group A pointing working group was set-up early 2008, by the SciOps WG between Project, MOC (FD), HSC and ICCs. A pointing calibration plan was issued –T. Marston, HERSCHEL-HSC-DOC-1139, v1.0, 5/8/2008 –Herschel relies on PACS (blue) photometer for spacecraft pointing performance assessment The plan was later de-scoped to only use Star Tracker 1

Bruno Altieri Jan # 3 Pointing calibration plan Pointing cal. plan became part of PV phase to a large fraction, hence now in PACS PV plan –But time budget counted separately –Obviously must be scheduled as early as possible. –Preceded by in commissioning : ACMS commissioning in CoP Photometer bias set-up (BOLO_BIAS_2) PACS search scan map (CoP) Check of derived SIAM update (CoP) Total estimated time : ~30 hours –In the PVPhotFPG program –Does not include 7.5 hours of spectrometer FPG.

Bruno Altieri Jan # 4 Pointing calibration CoP Initial search map –40’x40’ scan map: wide search to include STR structure bending, M2 misalignment.. –M51 ? ISO first light Advantages: –Visible 23/04 – 09/08 –Hint about orientation Drawback –Not point-like, but companion is ! Derive SIAM Check SIAM update –Standard PS mode –HIP (always visible) 140 Jy Already a scan map at the end of BOLO_BIAS_2 ?

Bruno Altieri Jan # 5 Pointing calibration PV Pointing cal. plan became part of PV phase to a large fraction, hence now in PACS PV plan –But time budget counted separately –Obviously must be scheduled as early as possible. –Preceded by in commissioning : ACMS commissioning in CoP Photometer bias set-up (BOLO_BIAS_2) PACS search scan map (CoP) Check of derived SIAM update (CoP) Total estimated time : ~30 hours –In the PVPhotFPG program –Does not include 7.5 hours of spectrometer FPG.

Bruno Altieri Jan # 6 Pointing calibration Stars sample selected by Markus Nielbock –PACS pointing calibration stars (PICC-MA-TN-003) Measure APE statistically with “many” stars –40 stars, 5mn AORs, for standard SAA range [-10,30] –Duration :~4 hours Tune SIAM Explore the full SAA range after a long stabilisation –[-20,-10] –[-30, -20] SRPE measurement assessment, –Making use of on-ground gyro propagation

Bruno Altieri Jan # 7 Pointing observation plan (1)

Bruno Altieri Jan # 8 Pointing observation plan (2)

Bruno Altieri Jan # 9 Tests and CAP SOVT-1: standard AORs SOVT-2 –OD 60, 63 & 64 –Only looked at OD 60 so far Dithering was not put (gain?) SIMS-1 –OD 65 already delivered (standard AORs) CAP from Dieter Tested 2D gaussian fitting in dp-pacs –Though not as robust as in IDL