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HUT FITS Keywords

References and comments on FITS keywords are listed below. See main page for background.


Keyword Reference(s) Comments/Notes
GENERAL KEYWORDS
EXTNAME See FITS standards document. FITS convention for naming binary table extension. MAST files use name "spectral container".
EQUINOX private communication Calculated by staff from original 1950 coordinates.
RADECSYS 'FK5' Comments here
TIMESYS 'UTC' Time system
MJDREF 0.00000 [d] MJD zero point for times
SPECSYS 'TOPOCEN' no heliocentric-correction
VOCLASS 'SPECTRUM V1.0' VO Data Model
VOSEGT 'SPECTRUM' Segment type
DATALEN derived from data [ ] Number of points in spectrum
DSSOURCE 'POINTED' Survey or Pointed
DATA ID KEYWORDS
DATE private communication (Mary Romelfanger) Processing-Creation Date
VODATE from DATE keyword Curation Date
VOREF 'http://archive.stsci.edu/vodoc/hut' URL for Documentation
DS_IDENT derived from filename Publishers Data Set ID
VERSION '1.0' Processing Version
COLLECT 'ASTRO/HUT' Data Set Collection
INSTRUME from INSTRUME keyword Comments here
TELESCOP 'HUT' Telescope
FILENAME file name File Name
CR_IDENT root name derived from filename Internal dataset ID
CRETYPE 'Archival' Not an on-the-fly dataset
CURATION KEYWORDS
VOPUB 'MAST' VO Publishing Authority
AUTHOR 'HUT project' Creator
VOPUBID 'ivo://mast.stsci.edu' URI for VO Publisher
VOLOGO 'http://archive.stsci.edu/images/100.mastlogo.gif' MAST logo
VOVER '1.0' VO Curation version
VORIGHTS 'PUBLIC' Data is public
CONTACT 'archive help desk' Comments here
EMAIL 'archive@stsci.edu' Comments here
TARGET KEYWORDS
OBJECT from OBJECT keyword proposer's target name
TITLE derived from FILENAME and OBJECT Program Identification
RA_TARG same value as used for ra (see below) [deg] right ascension of target
DEC_TARG same value used for dec (see below) [deg] declination of target
WCS Paper 3 Keywords
1S2_1 'WAVE' Column name with spectral coordinates
1CYTP2 'WAVE-TAB' Spectral coordinate is wavelength
1S3_1 'WAVE' Column name with spectral coordinates
1CYTP3 'WAVE-TAB' Spectral coordinate is wavelength
COVERAGE: SPATIAL
RA from HUT project web site (see http://praxis.pha.jhu.edu/science/specpg2.html [deg] project-defined right ascension
DEC same as for ra [deg] project-defined declination
APERTURE derived from SLIT keyword [arcsec] Aperture (radius or lengthxwidth)
COVERAGE: TEMPORAL
DATE-OBS from DATE-OBS keyword UT observation start time
EXPOSURE from keyword EXPOSURE [s] exposure duration
TSTART from DATE-OBS keyword (converted to MJD using IDL program juldate.pro) [d] MJD exposure start time
TSTOP TSTART + exposure [d] MJD exposure stop time
TMID average of TSTART and TSTOP [d] MJD exposure mid time
COVERAGE: SPECTRAL
SPECSDIM '1.0E-10 L' Comments here
SPEC_CAL 'Calibrated' Calibrated spectral coordinate
SPEC_ERR 0.200000 [angstrom] Wavelength statistical error
SPECBAND 'Extreme-UV,Far-UV' Spectral Band(s)
SPEC_VAL derived from data [angstrom] Mean Wavelength
SPEC_BW derived from data [angstrom] Bandpass Width Wmax - Wmin
SPEC_FIL 1.00000 [ ] No gaps between points
SPEC_RP 500 [ ] average resolving power W/dW
COVERAGE: OBSERVABLE
FLUXSDIM '1.0E+7 ML-1T-3' Flux SIDim
FLUX_CAL 'Calibrated' Calibrated Fluxes
STAT_ERR 10 [ ] flux error in percent
DER_SNR stoehr et all. 2007 Space Telescope Coordination Fac. NL 42,4. See der_snr.pdf [ ] Derived signal-to-noise ratio
FLUXAVG derived from data [erg/cm**2/s/angstrom] Average Flux
FLUXMAX2 derived from data [erg/cm**2/s/angstrom] 98% Maximum Flux
SPECDISP derived from data [angstrom/pixel] Dispersion