The 2011 Chandra Alignment Shift

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Presentation transcript:

The 2011 Chandra Alignment Shift Presented to the Chandra Users Committee By Scott J. Wolk (SAO/CXC) With thanks to Tom Aldcroft and Ping Zhao

Outline Discuss the alignment shift and our response Discuss the impact of the ACA housing temperature Discuss the global offset shift Discuss the new offset for Cycle 14 and Cycle 13 moving forward.

Fiducial Transfer System

Fiducial Light Drift Safe Mode July6 Probable cause of drift: Shifting ACA alignment Not credible Physical shift of the SIM relative to the OBA Bending of the OBA Material properties inconsistent with either of these. Alignment drift in the FTS Not credible would cause astrometry errors in ACA Would not affect pointing Notice the width is also increasing ACA Cool down – June 2003, Nov 2006 Aim point changed – Feb 2007

Fid Light Drift & ACA Housing Temperature fid offset a M * ACA_housing_temp

Fid Light Drift & ACA Housing Temperature fid offset = M * ACA_housing_temp + B fid offset = M * ACA_housing_temp + B + 6.5”

FID Light Drift & ACA Housing Temperature

Fid Light Drift The combination of 6.5” shift + greater thermal excursions of the ACA Housing heater lead to total shifts of up to 12” from the nominal aimpoint

ACIS-S Aimpoint – Prior to safemode Since 2007 1999-2006 1999.8 offset 2006-2007 2011.0

ACIS-S Aimpoint –after safemode

ACIS-S Aimpoint – Data Range

ACIS-S Aimpoint – final offset Yoffset :+9”

ACIS-I Aimpoint – Prior to safemode

ACIS-I Aimpoint –after safemode

ACIS-I Aimpoint – with new offset

ACIS-I Aimpoint – data range

HRC 2011.0 2011.0 1999.8 1999.8

HRC 2011.0 2011.0 1999.8 1999.8

Status No data have been lost Astrometry is unaffected. Some are filtered out between Level 1 and Level 2 Astrometry is unaffected. Mean y shift is about 6.5 sec. Maximum shift from desired aimpoint of about 12” in cold cases Shift in z of about 2.5 sec. Bulletin message sent out. Error budget information added to observer letter. On September 1 we adopted global offset of +0.15’ (9”) in Y to ALL observations in OCAT prevent target from hitting node boundary. Only ACIS-S required the change, others are being backed out Default offsets as of Oct 15: ACIS-S default offset:+0.15’(Y) -0.25’ (Z) ACIS-I default offset:-0.20’(Y) -0.25’ (Z) HRC-S and HRC-I Y and Z offset = +0.0’

Next Tasks Modify OCAT so that the new +9" applies only to ACIS-S. Update to RPS to add +0.15’ in Y ACIS-S. Updated aimpoint measurements will be release by CAL this week and forwarded to the CALDB for formal approval for Cycle 14. Modify default ACIS-S aimpoint in ObsVis. Modify RPS DDT Help Chandra_RfO_DDT/RPS.pl Modify RPS AO14 Help. Update proposer/new_aimpoint.html Modify POG ACIS aimpoint section.