This is a list of keywords that you might consider for image data. Some of them are probably inappropriate in the case of composite images. However, we encourage you to browse through them and think about which ones might apply to your particular HLSP.
| Keyword | Description |
| TARGNAME | target name (according to raw data or catalog) |
| IMTYPE | image type (e.g. cutout, coaddition, resampled) |
| TELESCOP | observatory (e.g. HST, IUE, ISO, ESO-VLT1) |
| INSTRUME | instrument (e.g. WFPC2, ACS, ISOCAM, TIMMI2) |
| INSTMODE | full description of instrument setting (e.g. ACS WFC1 F475W) |
| APERTURE | aperture of the instrument |
| WAVECENT | central wavelength |
| (DETECTOR) | detector of the instrument |
| (FILTER[n]) | filters |
| (POSANGLE) | position angle |
| OBSDATE | date of observation |
| EXPSTART | start time of observation |
| EXPEND | end time of observation |
| EXPTIME | effective exposure time (seconds) |
| NAXIS | number of data axis |
| BITPIX | number of bits that represent a data value |
| NAXIS[n] | number of points on axis [n] |
| AXIS[n] | name of axis [n] |
| AUNIT[n] | unit of axis [n] |
| CRPIX[n] | pixel at axis origin |
| CRVAL[n] | value at axis origin |
| CDELT[n] | increment |
| CTYPE[n] | description of axis (array) |
| MINFLUX | minimum flux |
| MINFUNIT | minimum flux unit |
| MAXFLUX | maximum flux |
| MAXFUNIT | maximum flux unit |
| RESOLUTIO | spatial resolution |
| ... | data quality |
| ... | limiting magnitude |
Examples for image headers
There are links to sample FITS headers for some HLSP. Please note that these headers were created prior to the current guidelines and may not fully meet the current standards.