JWST Proposal 1135 (Created: Tuesday, May 24, 2016 8:16:32 AM EST) - Overview
1135 - OTE-02: STA-FGS Alignment Matrix Update -1 (for DTA Deploy Errors)
Cycle: 0, Proposal Category: COM/OTE
(Availability Mode: <TBD>)
INVESTIGATORS
Name
Mr. Matthew D. Lallo (PI)
Dr. Christopher C. Stark (CoI)
OBSERVATIONS
Folder Observation
Observation Folder
1
2
3
4
Institution
Space Telescope Science Institute
Space Telescope Science Institute
E-Mail
lallo@stsci.edu
cstark@stsci.edu
Label
Observing Template
Science Target
RT upload
Module A
Both modules
Backup 3x3 Mosaic
Realtime Commanding
NIRCam Imaging
NIRCam Imaging
NIRCam Imaging
NONE
(2) HD-84406
(2) HD-84406
(2) HD-84406
ABSTRACT
Due to uncertainties in the alignment of the JWST Deployable Tower Assembly (DTA) we may have a systematic pointing error of tens of
arcminutes, and we do not wish to carry that error into subsequent commissioning steps
In OTE-01, we will have just found the segment PSF positions (for most/all segments), and based on that data we will choose some location relative
to the segment distribution that we wish to define as the target position for subsequent operations.
This proposal uses that chosen location to update the relationship of the JWST star tracker (STA) coordinate frame to the FGS1 Ideal frame, This
calibrates the telescope "boresight", so that in subsequent activities the selected location within the segment PSF pattern for a target star can be
delivered by the ACS to the intended location within e.g. NIRCam module FOV.
1
JWST Proposal 1135 (Created: Tuesday, May 24, 2016 8:16:32 AM EST) - Overview
After executing the memory load to apply the updated FGS Ideal-to-J-frame alignment matrix onboard, we will take confirmation images to verify
desired pointing. This is done with 2 observations (module A first, then both modules) to get enough coverage to detect a number of segment PSFs.
A small mosaic is also programmed on hold in case the segment distribution is more sparse than expected.
See the document PIF OTE-02 which gives a detailed discussion of Alignment Matrix Update - 1
OBSERVING DESCRIPTION
PURPOSE:
Execute memory load to update the FGS Ideal-to-J-frame alignment matrix. This relates star trackers to FGS, so that a selected location centered on
the segment PSF pattern for a target star can be delivered by the ACS to the intended location within the NIRCam module FOV. After that load has
been applied onboard, take an image to confirm desired pointing.
See the document PIF OTE-02 which gives a detailed description of Alignment Matrix Update - 1
RATIONALE:
Due to uncertainties in the alignment of the JWST Deployable Tower Assembly (DTA) we may have a systematic pointing error of tens of
arcminutes, and we do not wish to carry that error into subsequent commissioning steps
In OTE-01, we will have just found the segment PSF positions (for most/all segments), and based on that data we will choose some location relative
to the segment distribution that we wish to define as the target position for subsequent operations.
OBSERVATIONS:
The first APT activity is a Real-time Commanding upload of the new k-constants comprising the FGS Ideal-to-J-frame Rotation Matrix. (These will
2
JWST Proposal 1135 (Created: Tuesday, May 24, 2016 8:16:32 AM EST) - Overview
be generated prior to upload by a team consisting of the authors, FOT, and/or NGAS, TBD, using an NGAS-supplied tool/procedure and usersupplied empircally determined information.).
The subsequent activities are two NIRCam observations, required to execute after the RT commanding. The first is centered on the A module and the
2nd is centered on both modules.
The 1st observation provides the opportunity for a simple directly measurable pixel location of the desired point within the segment.
The 2nd observation provides greater coverage for greater chance of getting multiple PSFs (and is relatively low cost) to support a more accurate fit
of the location of the desired point.
Finally, we include a 3rd observation that is on hold, which is a 3x3 mosaic. This last observation should only be executed if the first two return an
ambiguous portion of the PSF cloud.
3
Special Requirements Spectral Elements Template
Observation
Proposal 1135 - Observation 1 - OTE-02: STA-FGS Alignment Matrix Update -1 (for DTA Deploy Errors)
Proposal 1135, Observation 1
Diagnostic Status: No Diagnostics
Observing Template: Realtime Commanding
Comments: 1. Deliver appropriate spacecraft memory load containing the alignment matrix k-constants to the Loads PRD. Rapid CM/CM/CRB approval
2. Create Ops Request for the realtime upload.
3. Once the Ops Request is received by the FOS, retrieve the Spacecraft memory load from the Loads PRD and prepare for uplink.
4. Execute ops request to upload the k-constants.
5. OP will resume in accordance with the RT Commanding Duration values.
Realtime Duration
Handoff Window Duration
Initial Setup Duration
Cleanup Duration
3600
600
600
#
1
No Parallel
Realtime
Required
2 After 1
3 After 1
4 After 1
4
Tue May 24 13:16:32 GMT 2016
Aperture
Special Requirements Spectral Elements Dithers Template Fixed Targets Observation
Proposal 1135 - Observation 2 - OTE-02: STA-FGS Alignment Matrix Update -1 (for DTA Deploy Errors)
Proposal 1135, Observation 2
Diagnostic Status: No Diagnostics
Observing Template: NIRCam Imaging
#
(2)
Tue May 24 13:16:32 GMT 2016
Name
HD-84406
Target Coordinates
Targ. Coord. Corrections
RA: 09 47 30.5542 (146.8773092d)
Dec: +63 14 52.11 (63.24781d)
Equinox: J2000
Comments: This object was generated by the targetselector and retrieved from the SIMBAD database.
Module
A
#
1
Fluxes (micro-Jy)
Miscellaneous
Subarray
FULL
Primary Dither Type
NONE
Full Primary Dithers
Primary Dithers
Camera
Dither Size
#
Short Filter
Long Filter
Readout Pattern
No. of Groups
No. of Integrations
1
F212N
F480M
BRIGHT1
4
1
PCS Mode COARSE
Wavefront Sensing SENSING_ONLY
2 After 1
5
Subpixel Positions
1
Photon Collect Duration Total Photon Collect
Duration
75.157
75.157
Special Requirements Spectral Elements Dithers Template Fixed Targets Observation
Proposal 1135 - Observation 3 - OTE-02: STA-FGS Alignment Matrix Update -1 (for DTA Deploy Errors)
Proposal 1135, Observation 3
Diagnostic Status: No Diagnostics
Observing Template: NIRCam Imaging
#
(2)
Tue May 24 13:16:32 GMT 2016
Name
HD-84406
Target Coordinates
Targ. Coord. Corrections
RA: 09 47 30.5542 (146.8773092d)
Dec: +63 14 52.11 (63.24781d)
Equinox: J2000
Comments: This object was generated by the targetselector and retrieved from the SIMBAD database.
Module
ALL
#
1
Fluxes (micro-Jy)
Miscellaneous
Subarray
FULL
Primary Dither Type
NONE
Full Primary Dithers
Primary Dithers
Camera
Dither Size
#
Short Filter
Long Filter
Readout Pattern
No. of Groups
No. of Integrations
1
F212N
F480M
BRIGHT1
4
1
PCS Mode COARSE
Wavefront Sensing SENSING_ONLY
3 After 1
6
Subpixel Positions
1
Photon Collect Duration Total Photon Collect
Duration
75.157
75.157
Special Requirements Spectral Elements Dithers Template Fixed Targets Observation
Proposal 1135 - Observation 4 - OTE-02: STA-FGS Alignment Matrix Update -1 (for DTA Deploy Errors)
Proposal 1135, Observation 4
Diagnostic Status: No Diagnostics
Observing Template: NIRCam Imaging
#
(2)
Tue May 24 13:16:32 GMT 2016
Name
HD-84406
Target Coordinates
Targ. Coord. Corrections
RA: 09 47 30.5542 (146.8773092d)
Dec: +63 14 52.11 (63.24781d)
Equinox: J2000
Comments: This object was generated by the targetselector and retrieved from the SIMBAD database.
Module
ALL
#
1
Fluxes (micro-Jy)
Miscellaneous
Subarray
FULL
Primary Dither Type
NONE
Full Primary Dithers
Primary Dithers
Camera
Dither Size
#
Short Filter
Long Filter
Readout Pattern
No. of Groups
No. of Integrations
1
F212N
F480M
BRIGHT1
4
1
Sequence Visits within 53.0 Days
Visits Same PA
PCS Mode COARSE
On Hold Only execute if Obs 1 and Obs 2 do not detect enough PSFs to determine pointing.
Wavefront Sensing SENSING_ONLY
4 After 1
7
Subpixel Positions
1
Photon Collect Duration Total Photon Collect
Duration
75.157
75.157