POA: POA_CALFOS Keywords ST-ECF

Running 'poa_calfos' will produce a '.poa' output file. The following is a list of POA related "keywords" which are written to this file, for every spectrum in the dataset being processed. The values are calculated when running 'poa_calfos'; as such they are a measure of the new re-calibration algorithm parameters/results/final offsets/etc.

IMPORTANT NOTE: These keywords are not covered by STScI ICD-49 and may not be recognized by STScI IRAF/STSDAS software designed for analysis of FOS data. They have been checked against the current (15-Jul-2000) content of the STScI Calibration Data Base System (CDBS) keyword data base to avoid conflicts, but such conflicts may arise from unnoticed updates of ICD-49 and the corresponding Keyword Database (KWDB).

NOTE ON FITS FORMAT: Ready processed data from the OTF CADC or STECF archives that wasrequested to be on ftp download, will be in FITS format with the exception of the rootname.poa file (which will be in ascii form). For processed data which was requested on FITS (only) tape, all files will be in FITS format. In this case, the root.poa.fits file (as well as any of the log.fits files) can be viewed with the following command:

unix shell> cat root.poa.fits | fold -w80 | more


Keyword
Units
Format
Description
MIDTIMP
MJD

R*8

Epoch at midpoint of integration as
modified Julian Date

POAXP km R*8 Spacecraft position in orbit at
MIDTIMP epoch. Obtained from daily NORAD
3line ephemeris (TLES) (accuracy approx 100 m).


POAYP km R*8
POAZP
km

R*8

VXP km/s R*4 Spacecraft velocity in orbit at MIDTIMP
epoch. Obtained from daily
NORAD 3line ephemeris
(TLES) (accuracy approx 1 m/s).

VYP km/s R*4
VZP
km/s

R*4

PVX km/s R*4 Velocity components in detector co-ordinates

PVY km/s R*4
PVZ
km/s

R*4

BNP Gauss R*4 Geomagnetic model
(North, East, Down)

BEP Gauss R*4
BDP
Gauss

R*4

BV1P Gauss R*4 Predicted geomagnetic field in
magnetometer coordinates (V1,V2,V3)

BV2P Gauss R*4
BV3P
Gauss

R*4

BDXP Gauss R*4 Magnetic field in detector coordinates
(X aligned with dispersion direction, Y perpendicular,
Z along digicon axis pointing from photocathode to diode array).

BDYP Gauss R*4
BDZP
Gauss

R*4

YGMPXSCL diode-width/Gauss R*4 GIMP effect scale factors in POA model. For data obtained after activation of on-board deGIMP (YFGIMPEN = TRUE) this includes the correction for on-board deGIMP error.

YGMPYSCL
diode-width/Gauss

R*4

YOFFXP diode-width R*4 GIMP related offsets

YOFFYP
diode height

R*4

YYBASE0
ybases

R*4

Reference YBASE value of dispersion solution for
wavelength calibration.

YYBSXSCL
diode-width/ybases

R*4

Scale factor for X-offset from difference in YBASE-YYBASE0

YMEANTMP
deg(C)

R*4

Average temperature in FOS optical assembly

YTMPXSCL
diode-width/deg(C)

R*4

Scale factor for X-offset derived from YMEANTMP

YAPGRTX0
diode-width

R*4

Aperture/Grating/Mode specific zero point w.r.t.
dispersion solution

YXCEN
pixel

R*8

Measured shift in X w.r.t. template spectrum

GLNGP DEG R*4 Geocentric Longitude/Lattitude
of HST at MIDTIMP epoch

GLATP
DEG

R*4

MLNGP DEG R*4 Longitude/Latitude of HST in geomagnetic dipole model at MIDTIMP epoch

MLATP
DEG

R*4

ALNGP DEG R*4 Associated Longitude/Latitude of HST in international
geomagnetic reference frame (IGRF) at MIDTIMP epoch



ALATP
DEG

R*4

OFF_DIOD diodes R*4

POA GIMP shift correction in X


OFF_PIX
pixel

R*4





POA | ESA | NASA | ST-ECF Archive | ESO | ST-ECF | STScI | Search

[STECF HOME]