Shear PSF Field Parameters¶

Data product name¶

shePsfFieldParameters

Data product custodian¶

SHE

Data model tag¶

8.0

Name of the Schema file¶

ST_DM_Schema/dictionary/pro/she/euc-test-she.xsd

Schema documentation tag¶

Documentation for data product element shePsfFieldParameters:

This product contains the parameters for the Shear PSF Field.

Documentation for data product element Header:

The generic header of the product.

Data product elements¶

DataStorage (shePsfFieldParametersFile)

DataContainer (dss:dataContainer)

Processing Element(s) creating/using the data product¶

SHE

Processing function using the data product¶

SHE

Detailed description of the data product¶

PSF field parameters product, giving the telescope state for a given exposure. Parameterisation for this data model largely consists of a subset of those included in the she_psfcalibration data product, as it is limited to only those parameters which are expected to vary on an exposure-to-exposure time scale (or on a time scale less than calibration observation cadence). Finalised Format TBD.

The FITS output file will contain the following information:

HDU List

Telescope Mode parameters
Zernike Mode Parameters
Other model parameters
Diagnostics

Primary Header¶

The primary head will contain the following additional information:

Time Stamp: Indentifies the date and time of fit.
VIS ExtName: Identifies the VIS exposure that this is linked to

Telescope Mode parameters¶

Currently 19 telescope model parameters are considered:

TCON: Change in conicity
TRAD: Perturbations on radius of element
TFRN: FOM1,2,3 only. Flatness of mirror
TX: Translation in X (plane of exit pupil)
TY: Translation in Y (plane of exit pupil)
TZ: Translation in Z
RX: Rotation in X
RY: Rotation in Y

The catalogue will contain the following columns

Parameter name	Element	Type
SHE_PSF_FIELD_M1TRAD	M1	Radial
SHE_PSF_FIELD_M2TRAD	M2	Radial
SHE_PSF_FIELD_FOM1TFRN	FOM1	Flatness
SHE_PSF_FIELD_FOM2TFRN	FOM2	Flatness
SHE_PSF_FIELD_M3TRAD	M3	Radial
SHE_PSF_FIELD_DIC_TFRN	Dichroic	Flatness
SHE_PSF_FIELD_M1TCON	M1	Conicity
SHE_PSF_FIELD_M2TCON	M2	Conicity
SHE_PSF_FIELD_M3TCON	M3	Conicity
SHE_PSF_FIELD_M2TZ	M2	Translation Z
SHE_PSF_FIELD_M2TX	M2	Translation X
SHE_PSF_FIELD_M2TY	M2	Translation Y
SHE_PSF_FIELD_M2RX	M2	Rotation X
SHE_PSF_FIELD_M2RY	M2	Rotation Y
SHE_PSF_FIELD_M3TZ	M3	Translation Z
SHE_PSF_FIELD_M3TX	M3	Translation X
SHE_PSF_FIELD_M3TY	M3	Translation Y
SHE_PSF_FIELD_M3RX	M3	Rotation X
SHE_PSF_FIELD_M3RY	M3	Rotation Y

Zernike Mode Parameters¶

Zernike fit parameters refer to Zernike Polynomial amplitudes themselves. The FITS catalogue will contain the following columns:

SHE_PSF_FIELD_FOVRNGX: Region of fit on the field of view in X
SHE_PSF_FIELD_FOVRNGY: Region of fit on the field of view in Y
SHE_PSF_FIELD_ZNKPLYAMP: List of Zernike Polynomial amplitudes

Diagnostics¶

Diagnostics includes information used to verify the quality of the fit on a per-training object basis. The catalogue form is TBF, but is expected to contain a list of stellar object identifiers, as well as \chi^2 for each.

Will include catalogue of star identifier with \chi^2 value per star, to satisfy R-SHE-PRD-F-100, as well as sub-pixel stellar position on the detector (2 floats).