Shear Star Catalog¶
Data product name¶
sheStarCatalog
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 sheStarCatalog:
This product contains updated star positions and fluxes using the best fit VIS PSF model.
Documentation for data product element Header:
The generic header of the product.
Data product elements¶
Base class: cat:observationCatalog
DataStorage (sheStarCatalogFile)
DataContainer (dss:dataContainer)
ExposureProductId (string)
ObservationDateTime (img:spaceObservationDateTime) [0-1]
Processing Element(s) creating/using the data product¶
SHE
Processing function using the data product¶
VIS
Detailed description of the data product¶
When fitting the optical PSF model, the PSF fitter also optimises for star detector position (at super-resolution and sub-pixel scale) as well as photon counts for the star. As a result, the PSF fitter can provide an update on the stellar position and counts which should be more accurate due to the improvement of the fit PSF model.
Note that inferred stellar position and counts values are maximum a-postoriori values conditioned on the best fit optical PSF model.
Uncertainties for position and counts are Hessian derived uncertainties.
This data will be stored as a fits file with multiple binary table HDUs, one for each exposure.
The values to be stored in this table are presently under consideration. We may store either X/Y or RA/DEC positions, or both, and we may find that FLUX is unnecessary.
Header values:
Keyword name |
Brief description |
Optional? |
|---|---|---|
ROLLANGL |
Roll angle of the telescope for this exposure in degrees |
No |
EXP_ID |
Product ID of the corresponding exposure image product for this HDU |
No |
OBS_ID |
Observation ID |
No |
DATE_OBS |
Date observation was taken |
No |
Columns:
Parameter name |
Fits Data type |
Brief description |
Optional? |
|---|---|---|---|
OBJECT_ID |
K |
ID of the object, matching to MER’s final catalog |
No |
SHE_STARCAT_DET_X |
I |
Detector where star is observed in this exposure, x index |
Yes |
SHE_STARCAT_DET_Y |
I |
Detector where star is observed in this exposure, y index |
Yes |
SHE_STARCAT_X |
E |
Best fit detector position of star in x |
Yes |
SHE_STARCAT_X_ERR |
E |
Uncertainty in fit detector position of star in x |
Yes |
SHE_STARCAT_Y |
E |
Best fit detector position of star in y |
Yes |
SHE_STARCAT_Y_ERR |
E |
Uncertainty in fit detector position of star in y |
Yes |
SHE_STARCAT_UPDATED_RA |
D |
Best fit world position of star in J2000 R.A. |
Yes |
SHE_STARCAT_UPDATED_RA_ERR |
E |
Uncertainty in fit world position of star in J2000 R.A. |
Yes |
SHE_STARCAT_UPDATED_DEC |
D |
Best fit world position of star in J2000 Dec. |
Yes |
SHE_STARCAT_UPDATED_DEC_ERR |
E |
Uncertainty in fit world position of star in J2000 Dec. |
Yes |
SHE_STARCAT_FLUX |
E |
Best fit flux value for star in ADU |
Yes |
SHE_STARCAT_FLUX_ERR |
E |
Uncertainty in fit flux value for star |
Yes |
SHE_STARCAT_E1 |
E |
Best fit ellipticity of the PSF in this exposure, component 1 in detector coords |
Yes |
SHE_STARCAT_E1_ERR |
E |
Uncertainty in E1 |
Yes |
SHE_STARCAT_E2 |
E |
Best fit ellipticity of the PSF in this exposure, component 2 in detector coords |
Yes |
SHE_STARCAT_E2_ERR |
E |
Uncertainty in E2 |
Yes |