| Keyword |
|
Description |
Format |
| SIMPLE |
= |
data conform to FITS standard (T/F) |
L1 |
| BITPIX |
= |
bits per data value |
I2 |
| NAXIS |
= |
number of data axes |
I2 |
| EXTEND |
= |
file may contain standard extensions (T/F) |
L1 |
| NEXTEND |
= |
number of standard extensions |
I2 |
| GROUPS |
= |
image is in group format? (T/F) |
L1 |
| DATE |
= |
date this file was written (yyyy-mm-dd) |
C10 |
| FILENAME |
= |
name of file |
C18 |
| FILETYPE |
= |
type of data found in data file |
C03 |
| TELESCOP |
= |
telescope used to acquire data |
C03 |
| INSTRUME |
= |
identifier for instrument used to acquire data |
C06 |
| EQUINOX |
= |
equinox of celestial coordinate system |
R4 |
| DATA DESCRIPTION KEYWORDS (All Detectors) |
| ROOTNAME |
= |
rootname of the observation set |
C09 |
| IMAGETYP |
= |
type of exposure identifier |
C18 |
| PRIMESI |
= |
instrument designated as prime |
C06 |
| TARGET INFORMATION (All Detectors) |
| TARGNAME |
= |
proposer's target name |
C30 |
| RA_TARG |
= |
right ascension of the target (deg) (J2000) |
R8 |
| DEC_TARG |
= |
declination of the target (deg) (J2000) |
R8 |
| PROPOSAL INFORMATION (All Detectors) |
| PROPOSID |
= |
PEP proposal identifier |
I4 |
| LINENUM |
= |
proposal log line number |
C15 |
| PR_INV_L |
= |
last name of principal investigator |
C30 |
| PR_INV_F |
= |
first name of principal investigator |
C20 |
| PR_INV_M |
= |
middle name / initial of principal investigator |
C20 |
| EXPOSURE INFORMATION (All Detectors) |
| SUNANGLE |
= |
angle between sun and V1 axis |
R4 |
| MOONANGL |
= |
angle between moon and V1 axis |
R4 |
| SUN_ALT |
= |
altitude of the sun above Earth's limb |
R4 |
| FGSLOCK |
= |
commanded FGS lock (FINE,COARSE,GYROS,UNKNOWN) |
C07 |
|
|
|
| DATE-OBS |
= |
UT date of start of observation (yyyy-mm-dd) |
C10 |
| TIME-OBS |
= |
UT time of start of observation (hh:mm:ss) |
C08 |
| EXPSTART |
= |
exposure start time (Modified Julian Date) |
R8 |
| EXPEND |
= |
exposure end time (Modified Julian Date) |
R8 |
| EXPTIME |
= |
exposure duration (seconds)--calculated |
R4 |
| EXPFLAG |
= |
exposure interruption indicator |
C13 |
| TARGET OFFSETS (POSTARGS) (All Detectors) |
| POSTARG1 |
= |
POSTARG in axis 1 direction |
R4 |
| POSTARG2 |
= |
POSTARG in axis 2 direction |
R4 |
| DIAGNOSTIC KEYWORDS (All Detectors) |
| CAL_VER |
= |
CALACS code version |
C24 |
| PROCTIME |
= |
pipeline processing time (MJD) |
R8 |
| SCIENCE INSTRUMENT CONFIGURATION (All Detectors) |
| OBSTYPE |
= |
observation type (imaging, spectroscopic, coronographic) |
C14 |
| OBSMODE |
= |
operating mode |
C08 |
| CTEIMAGE |
= |
type of Charge Transfer Image, if applicable |
C04 |
| SCLAMP |
= |
lamp status: NONE or name of lamp which is on |
C09 |
| NRPTEXP |
= |
number of repeat exposures in set (default=1) |
I2 |
| SUBARRAY |
= |
data from a subarray (T) or full frame (F) |
L1 |
| DETECTOR |
= |
detector in use: WFC, HRC or SBC |
C03 |
| FILTER1 |
= |
element selected from filter wheel 1 |
C18 |
| FILTER2 |
= |
element selected from filter wheel 2 |
C18 |
| LRFWAVE |
= |
proposed linear ramp filter wavelength |
R4 |
| APERTURE |
= |
aperture name |
C16 |
| PROPAPER |
= |
proposed aperture name |
C16 |
| CRSPLIT |
= |
number of cosmic ray split exposures |
I2 |
| DIRIMAGE |
= |
direct image for grism or prism exposure |
C09 |
| MAMA OFFSETS (SBC Only) |
| MOFFSET1 |
= |
axis 1 MAMA offset |
I2 |
| MOFFSET2 |
= |
axis 2 MAMA offset |
I2 |
| LOCAL RATE CHECK IMAGE (SBC Only) |
| LRC_XSTS |
= |
local rate check image exists (T/F) |
L1 |
| LRC_FAIL |
= |
local rate check failed (T/F) |
L1 |
| CALIBRATION SWITCHES: PERFORM, OMIT (All Detectors) |
| STATFLAG |
= |
calculate statistics? |
L1 |
| WRTERR |
= |
write out error array extension? |
L1 |
| DQICORR |
= |
data quality initialization? |
C08 |
| ATODCORR |
= |
correct for A to D conversion errors? |
C08 |
| BLEVCORR |
= |
subtract bias level computed from overscan image? |
C08 |
| BIASCORR |
= |
subtract bias image? |
C08 |
| FLSHCORR |
= |
subtract post flash image? |
C08 |
| CRCORR |
= |
combine observations to reject cosmic-rays? |
C08 |
| EXPSCORR |
= |
process individual observations after cr-reject? |
C08 |
| SHADCORR |
= |
apply shutter shading correction? |
C08 |
| DARKCORR |
= |
subtract dark image? |
C08 |
| FLATCORR |
= |
apply flat field correction? |
C08 |
| PHOTCORR |
= |
populate photometric header keywords? |
C08 |
| RPTCORR |
= |
add individual repeat observations? |
C08 |
| DITHCORR |
= |
process dithered images? |
C08 |
| CALIBRATION REFERENCE FILES (All Detectors) |
| BPIXTAB |
= |
bad pixel table |
C18 |
| CCDTAB |
= |
CCD calibration parameters |
C18 |
| ATODTAB |
= |
analog-to-digital correction file |
C18 |
| OSCNTAB |
= |
CCD overscan table |
C18 |
| BIASFILE |
= |
bias image file name |
C18 |
| FLSHFILE |
= |
post flash image file name |
C18 |
| CRREJTAB |
= |
cosmic-ray rejection parameters |
C18 |
| SHADFILE |
= |
shutter shading correction file |
C18 |
| DARKFILE |
= |
dark image file name |
C18 |
| PFLTFILE |
= |
pixel-to-pixel flat field file name |
C18 |
| DFLTFILE |
= |
delta-flat field file name |
C18 |
| LFLTFILE |
= |
low order flat |
C18 |
| GRAPHTAB |
= |
photometric throughput table |
C18 |
| COMPTAB |
= |
photometric throughput table |
C18 |
| IDCTAB |
= |
image distortion correction table |
C18 |
| COSMIC RAY REJECTION ALGORITHM PARAMETERS (WFC,HRC,HRC ACQ) |
| MEANEXP |
= |
reference exposure time |
R4 |
| SCALENSE |
= |
multiplicative scale factor applied to noise |
R4 |
| INITGUES |
= |
initial guess method (MIN or MED) |
C03 |
| SKYSUB |
= |
sky value subtracted (MODE or NONE) |
C04 |
| SKYSUM |
= |
sky level from the sum of all constituent images |
R4 |
| CRSIGMAS |
= |
statistical rejection criteria |
C15 |
| CRRADIUS |
= |
rejection propagation radius (pixels) |
R4 |
| CRTHRESH |
= |
rejection propagation threshold |
R4 |
| BADINPDQ |
= |
data quality flag used for rejection |
I2 |
| REJ_RATE |
= |
rate at which pixels are affected by cosmic rays |
R4 |
| CRMASK |
= |
flag CR-rejected pixels in input files? (T/F) |
L1 |
| PATTERN KEYWORDS (WFC, HRC, SBC) |
| PATTERN1 |
= |
primary pattern type |
C18 |
| P1_SHAPE |
= |
primary pattern shape |
C18 |
| P1_PURPS |
= |
primary pattern purpose |
C10 |
| P1_NPTS |
= |
number of points in primary pattern |
I2 |
| P1_PSPAC |
= |
point spacing for primary pattern (arcsec) |
R4 |
| P1_LSPAC |
= |
line spacing for primary pattern (arcsec) |
R4 |
| P1_ANGLE |
= |
angle between sides of parallelogram patt (deg) |
R4 |
| P1_FRAME |
= |
coordinate frame of primary pattern |
C09 |
| P1_ORINT |
= |
orientation of pattern to coordinate frame (deg) |
R4 |
| P1_CENTR |
= |
center pattern relative to pointing (yes/no) |
C03 |
| PATTSTEP |
= |
position number of this point in the pattern |
I2 |
| POST FLASH PARAMETERS (WFC, HRC, HRC ACQ) |
| FLASHDUR |
= |
exposure time in seconds: 0.1 to 409.5 |
R4 |
| FLASHCUR |
= |
post-flash current (OFF, LOW, MED, HIGH) |
C04 |
| FLASHSTA |
= |
status (SUCCESSFUL, ABORTED, NOT PERFORMED) |
C16 |
| SHUTRPOS |
= |
shutter position (A or B) |
C05 |
| ENGINEERING PARAMETERS (WFC, HRC, HRC ACQ) |
| CCDAMP |
= |
CCD amplifier read out configuration |
C04 |
| CCDGAIN |
= |
commanded gain of CCD |
I2 |
| CCDOFSTA |
= |
commanded CCD bias offset for amplifier A |
I4 |
| CCDOFSTB |
= |
commanded CCD bias offset for amplifier B |
I4 |
| CCDOFSTC |
= |
commanded CCD bias offset for amplifier C |
I4 |
| CCDOFSTD |
= |
commanded CCD bias offset for amplifier D |
I4 |
| CALIBRATED ENGINEERING PARAMETERS (WFC, HRC, HRC ACQ) |
| ATODGNA |
= |
calibrated gain for CCD amplifier A |
R4 |
| ATODGNB |
= |
calibrated gain for CCD amplifier B |
R4 |
| ATODGNC |
= |
calibrated gain for CCD amplifier C |
R4 |
| ATODGND |
= |
calibrated gain for CCD amplifier D |
R4 |
| READNSEA |
= |
calibrated read noise for amplifier A |
R4 |
| READNSEB |
= |
calibrated read noise for amplifier B |
R4 |
| READNSEC |
= |
calibrated read noise for amplifier C |
R4 |
| READNSED |
= |
calibrated read noise for amplifier D |
R4 |
| TARGET ACQUISITION PARAMETERS (HRC only) |
| ACQTYPE |
= |
type of acquisition |
C15 |
| ACQNAME |
= |
rootname of acquisition exposure |
C10 |
| TARGET ACQUISITION PARAMETERS (HRC ACQ only) |
| ACQTYPE |
= |
type of acquisition |
C15 |
| CENTMETH |
= |
target acquisition centering method |
C16 |
| CRELIM |
= |
perform cosmic ray rejection in acquisition |
L1 |
| CCDBIASS |
= |
CCD bias subtracted from Target Acq Image? |
L1 |
| BIASLEV |
= |
CCD bias level used to process acquisition exp. |
R4 |
| CHECKBOX |
= |
size of checkbox for finding algorithms |
I2 |
| TARGAREA |
= |
area of target (detector pixels) |
R4 |
| ASSOCIATION KEYWORDS (All Detectors) |
| ASN_ID |
= |
unique identifier assigned to association |
C10 |
| ASN_TAB |
= |
name of association table |
C18 |
| ASN_MTYP |
= |
role of exposure in association |
C12 |
| XTENSION |
= |
extension type |
C08 |
| BITPIX |
= |
bits per data value |
I2 |
| NAXIS |
= |
number of data axes |
I2 |
| NAXIS1 |
= |
length of first data axis |
I4 |
| NAXIS2 |
= |
length of second data axis |
I4 |
| PCOUNT |
= |
number of group parameters |
I2 |
| GCOUNT |
= |
number of groups |
I2 |
| INHERIT |
= |
inherit the primary header |
L1 |
| EXTNAME |
= |
extension name |
C06 |
| EXTVER |
= |
extension version number |
I2 |
| ROOTNAME |
= |
rootname of the observation set |
C09 |
| EXPNAME |
= |
9 character exposure identifier |
C09 |
| DATAMIN |
= |
minimum data value |
R8 |
| DATAMAX |
= |
maximum data value |
R8 |
| BUNIT |
= |
brightness units |
C18 |
| BSCALE |
= |
scale factor for array value to physical value |
R8 |
| BZERO |
= |
physical value for an array value of zero |
R8 |
| WFC CCD CHIP IDENTIFICATION (WFC only) |
| CCDCHIP |
= |
CCD chip (1 or 2) |
I2 |
| WORLD COORDINATE SYSTEM AND RELATED PARAMETERS (All Detectors) |
| CRPIX1 |
= |
x-coordinate of reference pixel |
R8 |
| CRPIX2 |
= |
y-coordinate of reference pixel |
R8 |
| CRVAL1 |
= |
first axis value at reference pixel |
R8 |
| CRVAL2 |
= |
second axis value at reference pixel |
R8 |
| CTYPE1 |
= |
the coordinate type for the first axis |
C08 |
| CTYPE2 |
= |
the coordinate type for the second axis |
C08 |
| CD1_1 |
= |
partial of first axis coordinate w.r.t. x |
R8 |
| CD1_2 |
= |
partial of first axis coordinate w.r.t. y |
R8 |
| CD2_1 |
= |
partial of second axis coordinate w.r.t. x |
R8 |
| CD2_2 |
= |
partial of second axis coordinate w.r.t. y |
R8 |
| LTV1 |
= |
offset in X to subsection start |
R4 |
| LTV2 |
= |
offset in Y to subsection start |
R4 |
| LTM1_1 |
= |
reciprocal of sampling rate in X |
R4 |
| LTM2_2 |
= |
reciprocal of sampling rate in Y |
R4 |
| PA_APER |
= |
position angle of reference aperture center (deg) |
R8 |
| ORIENTAT |
= |
position angle of image y axis (degrees E of N) |
R4 |
| PA_V3 |
= |
position angle of V3-axis of HST (deg) |
R4 |
| READOUT DEFINITION PARAMETERS (All Detectors) |
| CENTERA1 |
= |
subarray axis1 center point in unbinned dectector pixels |
I4 |
| CENTERA2 |
= |
subarray axis2 center point in unbinned dectector pixels |
I4 |
| SIZAXIS1 |
= |
subarray axis1 size in unbinned detector pixels |
I4 |
| SIZAXIS2 |
= |
subarray axis2 size in unbinned detector pixels |
I4 |
| BINAXIS1 |
= |
axis1 data bin size in unbinned detector pixels |
I2 |
| BINAXIS2 |
= |
axis2 data bin size in unbinned detector pixels |
I2 |
| PHOTOMETRY KEYWORDS (All Detectors) |
| PHOTMODE |
= |
observation configuration for photometric calibration |
C50 |
| PHOTFLAM |
= |
inverse sensitivity, erg cm-2 A-1 electron-1 |
R8 |
| PHOTZPT |
= |
ST magnitude zero point |
R4 |
| PHOTPLAM |
= |
pivot wavelength |
R4 |
| PHOTBW |
= |
rms bandwidth of filter plus detector |
R4 |
| REPEATED EXPOSURES INFO (WFC, HRC, HRC ACQ) |
| NCOMBINE |
= |
number of image sets combined during CR rejection |
I2 |
| DATA PACKET INFORMATION (All Detectors) |
| FILLCNT |
= |
number of segments containing fill |
I4 |
| ERRCNT |
= |
number of segments containing errors |
I4 |
| PODPSFF |
= |
podps fill present? (T/F) |
L1 |
| STDCFFF |
= |
ST DDF fill present? (T/F) |
L1 |
| STDCFFP |
= |
ST DDF fill pattern (hex) |
C10 |
| ON-BOARD COMPRESSION INFORMATION (WFC Only) |
| WFCMPRSD |
= |
WFC data compressed? (T/F) |
L1 |
| COMPTYP |
= |
compression type performed? (Partial/Full) |
C08 |
| CBLKSIZ |
= |
size of compression block in bytes |
I4 |
| LOSTPIX |
= |
number of pixels lost due to buffer overflow |
I4 |
| TARGET ACQUISITION PARAMETERS (HRC ACQ Only) |
| TARGA1 |
= |
fsw located subarray axis1 coord. of target |
R4 |
| TARGA2 |
= |
fsw located subarray axis2 coord. of target |
R4 |
| APERA1 |
= |
fsw located subarray axis 1 coord. of aperture |
R4 |
| APERA2 |
= |
fsw located subarray axis 2 coord. of aperture |
R4 |
| APERLKA1 |
= |
axis 1 detector pixel of acq aperture center |
R4 |
| APERLKA2 |
= |
axis 2 detector pixel of acq aperture center |
R4 |
| MAXCHCNT |
= |
counts in the brightest checkbox |
R4 |
| BOPOFFA1 |
= |
axis 1 offset (arcs) object moved off aperture |
R8 |
| BOPOFFA2 |
= |
axis 2 offset (arcs) object moved off aperture |
R8 |
| ENGINEERING PARAMETERS (SBC Only) |
| GLOBRATE |
= |
global count rate |
R4 |
| GLOBLIM |
= |
was global linearity level exceeded? |
C16 |
| IMAGE STATISTICS AND DATA QUALITY FLAGS (All Detectors) |
| NGOODPIX |
= |
number of good pixels |
I4 |
| SDQFLAGS |
= |
serious data quality flags |
I4 |
| GOODMIN |
= |
minimum value of good pixels |
R4 |
| GOODMAX |
= |
maximum value of good pixels |
R4 |
| GOODMEAN |
= |
mean value of good pixels |
R4 |
| SOFTERRS |
= |
number of soft error pixels (DQF=1) |
I4 |
| MEANBLEV |
= |
average of all bias levels subtracted |
R4 |
| MEANDARK |
= |
average of the dark values subtracted |
R4 |
| MEANFLSH |
= |
average of the post flash values subtracted |
R4 |
