Shear Star Catalog¶
Metadata¶
Data product name |
DpdSheStarCatalog |
Data product custodian |
SHE |
Name of the Schema file |
|
Processing Element(s) creating/using the data product |
SHE |
Processing function using the data product |
SHE |
Proposed for inclusion in EAS/SAS |
This product is proposed for inclusion in the SAS: no |
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.
HDU SheStarCatalog: header |
|||
|---|---|---|---|
Name |
Description |
Value |
|
Keywords |
FITS_VER |
Table format version number |
string = 8.0 |
FITS_DEF |
Table format label |
string = she.starCatalog |
|
ROLLANGL |
Roll angle of the telescope for this exposure in degrees |
double |
|
EXP_PID |
Product IDs of the corresponding exposure image products for this catalog |
string |
|
OBS_ID |
Observation ID |
integer |
|
PNT_ID |
Pointing IDs |
integer |
|
DATE_OBS |
Date observation was taken |
string |
|
HDU SheStarCatalog: 34 columns table |
||||
|---|---|---|---|---|
Name |
Description |
Unit |
Format |
|
Columns |
OBJECT_ID |
ID of the object, matching to MER’s final catalog |
NA |
FITS K |
SHE_STARCAT_DET_X |
Detector where star is observed in this exposure, x index |
NA |
FITS I |
|
SHE_STARCAT_DET_Y |
Detector where star is observed in this exposure, y index |
NA |
FITS I |
|
SHE_STARCAT_X |
Best fit detector position of star in x |
NA |
FITS E |
|
SHE_STARCAT_X_ERR |
Uncertainty in fit detector position of star in x |
NA |
FITS E |
|
SHE_STARCAT_Y |
Best fit detector position of star in x |
NA |
FITS E |
|
SHE_STARCAT_Y_ERR |
Uncertainty in fit detector position of star in x |
NA |
FITS E |
|
SHE_STARCAT_RA |
Best fit world position of star in J2000 R.A. |
NA |
FITS D |
|
SHE_STARCAT_RA_ERR |
Uncertainty in fit world position of star in J2000 R.A. |
NA |
FITS E |
|
SHE_STARCAT_DEC |
Best fit world position of star in J2000 Dec. |
NA |
FITS D |
|
SHE_STARCAT_DEC_ERR |
Uncertainty in fit world position of star in J2000 Dec. |
NA |
FITS E |
|
SHE_STARCAT_FLUX |
Best fit flux value for star in ADU |
NA |
FITS E |
|
SHE_STARCAT_FLUX_ERR |
Uncertainty in fit flux value for star |
NA |
FITS E |
|
SHE_STARCAT_E1 |
Best fit ellipticity of the PSF in this exposure, component 1 in detector coords |
NA |
FITS E |
|
SHE_STARCAT_E1_ERR |
Uncertainty in E1 |
NA |
FITS E |
|
SHE_STARCAT_E2 |
Best fit ellipticity of the PSF in this exposure, component 2 in detector coords |
NA |
FITS E |
|
SHE_STARCAT_E2_ERR |
Uncertainty in E2 |
NA |
FITS E |
|
SHE_STARCAT_R2 |
NA |
FITS E |
||
SHE_STARCAT_STAR_QXX |
NA |
FITS E |
||
SHE_STARCAT_STAR_QYY |
NA |
FITS E |
||
SHE_STARCAT_STAR_QXY |
NA |
FITS E |
||
SHE_STARCAT_PSF_QXX |
NA |
FITS E |
||
SHE_STARCAT_PSF_QYY |
NA |
FITS E |
||
SHE_STARCAT_PSF_QXY |
NA |
FITS E |
||
SHE_STARCAT_RES_QXX |
NA |
FITS E |
||
SHE_STARCAT_RES_QYY |
NA |
FITS E |
||
SHE_STARCAT_RES_QXY |
NA |
FITS E |
||
SHE_STARCAT_USED_FOR_FIT |
NA |
FITS L |
||
SHE_STARCAT_GROUP_ID |
ID of group of stars fitted simultaneously which this star is a member of |
NA |
FITS K |
|
SHE_STARCAT_GROUP_CHISQ |
Chi-square value for the fit on the group of stars which this star is a member of |
NA |
FITS E |
|
SHE_STARCAT_GROUP_UNMASKED_PIX |
Total number of unmasked pixels for the group of stars fitted simultaneously which this star is a member of |
NA |
FITS J |
|
SHE_STARCAT_GROUP_N_FITTED_PARAMS |
Number of parameters used for the fit of the group of stars fitted simultaneously which this star is a member of |
NA |
FITS J |
|
SHE_STARCAT_STAR_CHISQ |
Chi-squared statistic for the residual of just this individual star |
NA |
FITS E |
|
SHE_STARCAT_STAR_UNMASKED_PIX |
Number of unmasked pixels unique to this individual star |
NA |
FITS J |
|