Follow UsEUVE FITS Keywords
References and comments on FITS keywords are listed below. See main page for background.
| Keyword | Reference(s) | Comments/Notes |
|---|---|---|
| GENERAL KEYWORDS | ||
| EXTNAME | standard FITS keyword | VO spectral container format |
| EQUINOX | from keyword EQUINOX | Comments here |
| RADECSYS | from keyword RADECSYS | FK5 time system |
| TIMESYS | 'UTC' | Technically, the times are CLOSE to UTC. From the description of the CLOCKCOR keyword: EUVE times are not guaranteed to be corrected to UT. Regular corrections are applied to the EUVE spacecraft clock to keep EUVE times near UT, but there is drift between corrections. The EUVE time is always kept within 0.9 msec of UT, and usually within 0.7 msec. |
| MJDREF | 0.00000 | [d] MJD zero point for times |
| SPECSYS | 'TOPOCENT' | wavelengths not corrected |
| 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 | from DATE keyword | Processing-Creation Date |
| VODATE | from IDL "today" command | Curation Date |
| VOREF | 'http://archive.stsci.edu/vodocs/euve' | URL for Documentation |
| DS_IDENT | 'ads/sa.euve#y_pup__9604051149N' | Publishers Data Set ID |
| VERSION | '1.0' | Processing Version |
| COLLECT | 'EUVE' | Data Set Collection |
| INSTRUME | from keyword INSTRUME | Instrument (DS/S) |
| TELESCOP | 'EUVE' | Data Set Collection |
| FILENAME | derived from data ID | File Name |
| CR_IDENT | derived from file name | Internal dataset ID |
| CRETYPE | 'Archival' | Not an on-the-fly dataset |
| CURATION KEYWORDS | ||
| VOPUB | 'MAST' | VO Publishing Authority |
| AUTHOR | 'EUVE project' | Data was extracted by Damian Christian and converted to VO format by MAST staff. Conversion included |
| VOPUBID | 'archive.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 |
| CONTRIB1 | from keyword OBSERVER | principal investigator |
| CONTACT | 'archive help desk' | Comments here |
| 'archive@stsci.edu' | Comments here | |
| TARGET KEYWORDS | ||
| OBJECT | from keyword OBJECT | proposer's target name |
| SRCCLASS | from project database | Object Class |
| SRTYPE | from project database | Spectral Type |
| TITLE | derived from filename and OBJECT keyword | fle, object |
| RA_TARG | from keyword RA_OBJ | right ascension of target |
| DEC_TARG | from keyword DEC_OBJ | declination of target |
| WCS Paper 3 Keywords | ||
| 1S2_1 | 'WAVE' | Column name with spectral coordinates |
| 1CYTP2 | 'WAVE-TAB' | Spectral coordinate is WAVE |
| COVERAGE: SPATIAL | ||
| RA | from keyword RA_PNT | right ascension of aperture |
| DEC | from keyword DEC_PNT | declination of aperture |
| APERTURE | private communication from Damian Christian based on APSRC keyword | width = 11 arcsec, length = 4.5 * slit heigth |
| COVERAGE: TEMPORAL | ||
| DATE-OBS | from DATE-OBS keyword | UT observation start time |
| EXPOSURE | from EXPTIME keyword | [sec] exposure duration |
| TSTART | from TSTART and MJDREF keywords | [MJD] exposure start time |
| TSTOP | from TSTOP and MJDREF keywords | [MJD] exposure stop time |
| TMID | derived from TSTART, TSTOP and MJDREF | [d] MJD exposure mid time |
| COVERAGE: SPECTRAL | ||
| SPECSDIM | '1.0E-10 L' | Comments here |
| SPEC_CAL | Calibrated spectral coordinate | |
| SPEC_ERR | 0.0500 ??? | [angstrom] Wavelength statistical error |
| SPECBAND | based on derived wavelength range and classifications by Paolo Padovani using the MAST program vo_specband | Spectral Band(s) (x-ray to extreme UV) |
| SPEC_VAL | derived from data | [A] Mean Wavelength |
| SPEC_BW | derived from data | [A] Bandpass Width Wmax - Wmin |
| SPEC_FIL | 1.0 | [ ] No gaps between points |
| SPEC_RP | EUVE GO Handbook | Comments here |
| COVERAGE: OBSERVABLE | ||
| FLUXSDIM | '1.0E+7 ML-1T-3' | Units were originally given in photons/cm2/s/A and were converted to ergs/cm2/s/A by staff members using data extracted by Damian Christian using euvextract |
| FLUX_CAL | Calibrated Fluxes | |
| STAT_ERR | ??? | [ ] flux error in percent 10%? |
| DER_SNR | Stoehr et al 2007 Space Tele Coord, Fac, NL 42,4. See der_snr.pdf | [ ] Mean 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 (Wmax-Wmin)/npts | [angstrom/pixel] Dispersion |
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