Why the keywords are essential for Subaru FITS data ?
| Keyword Name | Reason |
|---|
|
| AIRMASS | Roughly estimated one is convenient in archival search |
| BIN-FCT1 | The basic keyword for image features |
| BIN-FCT2 | The basic keyword for image features |
| BITPIX | The basic keyword for image features |
| BLANK | The basic keyword for image features |
| BSCALE | The basic keyword for image features |
| BUNIT | The basic keyword for image features |
| BZERO | The basic keyword for image features |
| CDELT1 | The basic keyword for image features |
| CDELT2 | The basic keyword for image features |
| CDj_i(I) | Essential for setting control comamnd to telescope (moving object onto the slit etc) |
| CRPIX1 | The basic keyword for image features |
| CRPIX2 | The basic keyword for image features |
| CRVAL1 | The basic keyword for image features |
| CRVAL2 | The basic keyword for image features |
| CTYPE1 | The basic keyword for image features |
| CTYPE2 | The basic keyword for image features |
| CUNIT1 | The basic keyword for image features |
| CUNIT2 | The basic keyword for image features |
| DATASET(*) | Only needed to OBJECT type data. Needed by DASH. |
| DATA-TYP | Used as an key for archival search and essential for data alalysis.(DASH etc) |
| DATE-OBS | The basic keyword for image features |
| DEC | The basic keyword for image features (origin of RA2000 & DEC2000) |
| DEC2000 | DEC may not be written in J2000.0. The key for archival search by coordinate. |
| DETECTOR | The basic keyword for image features |
| DET-TMP | The basic keyword for image features |
| DISPAXIS(S) | Convenient in spectrum plotting of raw data. |
| DISPERSR(S) | The basic keyword for image features |
| END | Essential for FITS data |
| EQUINOX | Essential for knowing RA and DEC eposh, and calculating RA2000 & DEC2000 |
| EXP-ID | For the grouping of data by simultaneous exposure. |
| EXPTIME | The basic keyword for image features |
| EXTEND | Essential for FITS data with ASCII Table Extensions. |
| FOC-POS | The basic keyword for observation description |
| FOC-VAL | Needed by QDAS in ficusing task. |
| FRAMEID | This is the unique key for archival system. |
| GAIN | The basic keyword for image features |
| HST | The basic keyword for observation description |
| INSTRUME | This is used in online data registration at Hilo. |
| LONGPOLE(I) | The basic keyword for image features |
| LST | The basic keyword for observation description |
| MJD | This is used in data search as a unique key for time. |
| NAXIS | Essential for FITS data |
| NAXIS1 | Essential for FITS data with 2-d image |
| NAXIS2 | Essential for FITS data with 2-d image |
| NAXIS3 | Essential for FITS data with 3-d image as those from MIRTOS |
| OBJECT | The basic keyword for observation description |
| OBS-ALOC | Can identify the control mode and where the instrument was. |
| OBSERVAT | The basic keyword for observation description |
| OBSERVER | The basic keyword for observation description |
| OBS-MOD | The key for selecting data in data search in archival system |
| PCnnnmmm(I) | Essential for setting control comamnd to telescope (moving object onto the slit etc) |
| POLARIZn(P) | The basic keyword for observation description |
| PROP-ID | Essential for setting view parameter in archival system |
| RA | The basic keyword for observation description (origin of RA2000 & DEC2000) |
| RA2000 | RA may not be written in J2000.0. Key for archival search by coordinate. |
| RADECSYS | RA and DEC may not be written in FK5. |
| RET-ANGn(P) | Essential in data analysis of polarimetric data. |
| RETPLATn | The basic keyword for observation description |
| SIMPLE | Essential for FITS data |
| SLIT(S) | The basic keyword for observation description |
| SLTCPIX1(S) | Convenient in making plot of raw data spectrum |
| SLTCPIX2(S) | Convenient in making plot of raw data spectrum |
| SLT-LEN(S) | The basic keyword for observation description |
| SLT-PA(S) | The basic keyword for observation description |
| SLT-WID(S) | The basic keyword for observation description |
| TELESCOP | Essential for knowing the origin of data |
| TELFOCUS | Can be one of the key for identifying the causarity of empty image. |
| TIMESYS | Essential for knowing time system used in the data |
| UT | The basic keyword for observation description |
| WAVELEN(S) | Convenient in making plot of raw data spectrum. |
| WAV-MAX(S) | Convenient in making plot of raw data spectrum. |
| WAV-MIN(S) | Convenient in making plot of raw data spectrum. |
| WCS-ORIG(I) | Used for identifying WCS is written by toolkit or not. |