Follow UsIUE FITS Keywords
References and comments on FITS keywords are listed below. See main page for background.
| Keyword | Reference(s) | Comments/Notes |
|---|---|---|
| GENERAL KEYWORDS | ||
| EXTNAME | 'Spectral Container' | Name given to binary table extension contained in MAST VO spectral container files |
| EQUINOX | NEWSIPS Manual, Ch. 14.2 | Comments here |
| RADECSYS | CDS, NEWSIPS Manual Ch. 14.2 | FK4 |
| TIMESYS | Telescope Operations office checked synchronization of their UT with USNO time service (per Scott Snell) | Time system was UTC |
| MJDREF | 0.00000 | [d] MJD zero point for times |
| SPECSYS | NEWSIPS Manual Ch. 14.2 | Low dispersion: topocentric, High dispersion: heliocentric |
| VOCLASS | 'SPECTRUM V1.0' | VO Data Model |
| VOSEGT | 'SPECTRUM' | Segment type |
| DATALEN | 563 | [ ] Number of points in spectrum |
| DSSOURCE | 'POINTED' | Survey or Pointed |
| DATA ID KEYWORDS | ||
| DATE | from IUE keyword DATE | Processing-Creation Date |
| VODATE | from IDL "today" command | Curation Date |
| VOREF | 'http://archive.stsci.edu/vodocs/iue' | URL for Documentation |
| DS_IDENT | 'ads/sa.iue#lwp09671mxlo' | Data Set Identifier |
| VERSION | '1.0' | Processing Version |
| COLLECT | mission/instrument from IUE keyword CAMERA | Data Set Collection (e.g., IUE/LWP) |
| INSTRUME | from IUE keyword CAMERA | Instrument |
| TELESCOP | 'IUE' | Internation Ultraviolet Explorer (IUE) |
| FILENAME | from IUE keywords CAMERA and IMAGE | File Name such as lwp0967mxlo_vo.fits |
| CR_IDENT | same as for filename | Internal dataset ID |
| CRETYPE | 'Archival' | Not an on-the-fly dataset |
| CURATION KEYWORDS | ||
| VOPUB | 'MAST' | VO Publishing Authority |
| AUTHOR | 'IUE project' | Creator |
| VOPUBID | 'ivo://mast.stsci.edu' | URI for VO Publisher |
| VOLOGO | 'http://archive.stsci.edu/images/100.mastlogo.gif' | MAST logo |
| CONTRIB1 | from IUE keyword PGM-ID which lists the IUE observing program ID | See http://archive.stsci.edu/iue/prog.html |
| CONTACT | 'archive help desk' | |
| STScI help desk: 'archive@stsci.edu' | ||
| TARGET KEYWORDS | ||
| OBJECT | from IUE keyword (L/S)TARGET | Supplied by GO (proposer's target name) |
| SRCLASS | from keyword (L/S)IUECLAS and converted from number to string title in MAST IDL routine ssap_header_iue.pro | See also NEWSIPS manual Ch. 14.2 |
| TITLE | 'lwp09671mxlo_vo.fits, L2 PUP' | Title is comprised of dataset name, target |
| RA_TARG | taken from IUE keyword (L/S)TARGRA | [deg] right ascension of target provided by GO |
| DEC_TARG | taken from IUE keyword (L/S)TARDEC | [deg] declination of target provided by GO |
| 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 |
| 1S4_1 | 'WAVE' | Column name with spectral coordinates |
| 1CYTP4 | 'WAVE-TAB' | Spectral coordinate is wavelength |
| COVERAGE: SPATIAL | ||
| RA | taken from IUE keyword (L/S)TARGRA | Comments here |
| DEC | taken from IUE keyword (L/S)TARGDEC | [deg] project-defined declination provided by GO |
| APERTURE | NEWSIPS manual Ch. 2.2, Tbl 2.1 based on IUE keyword APERTURE | [arcsec] radius or lengthxwidth |
| COVERAGE: TEMPORAL | ||
| DATE-OBS | from IUE keywords (L/S)DATEOBS and (L/S)TIMEOBS | Comments here |
| EXPOSURE | from IUE keyword (L/S)EXPTIME | [s] eff. exposure duration |
| TSTART | from IUE keyword (L/S)JD-OBS - 2400000. | [d] MJD exposure start time |
| TSTOP | 2 * TMID - TSTART | [d] MJD exposure stop time |
| TMID | from IUE keyword (L/S)JD-MID - 2400000. | [d] MJD exposure mid time |
| COVERAGE: SPECTRAL | ||
| SPECSDIM | '1.0E-10 L' | Comments here |
| SPEC_CAL | 'Calibrated' | Calibrated spectral coordinate |
| SPEC_ERR | 2.50000 | [angstrom] Wavelength statistical error |
| SPECBAND | Based on classification by Paolo Padovani using MAST IDL program vo_specband | See http://archive.stsci.edu/genlinks_help.html#data |
| 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 | NEWSIPS Manual Ch. 2.3 | average resolving power W/dW varies with camera, dispersion and aperture |
| COVERAGE: OBSERVABLE | ||
| FLUXSDIM | '1.0E+7 ML-1T-3' | Comments here |
| FLUX_CAL | 'Calibrated' | Calibrated Fluxes |
| STAT_ERR | 10 | [ ] flux error in percent |
| DER_SNR | Stoehr et al. 2007 Space Telescope Coordination Fac. NL, 42, 4 | 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 as (Wmax - Wmin)/npts | [angstrom/pixel] Dispersion |
 |
|
|
|
|
|
|
|
|
|