source,name,type,reference,Note,description
FITS_RES,DATE-OBS,time,FITS,MDI DATE-OBS is mean time as if at Earth.  See T_OBS,"The time and date of the start of the observation, in UT at the observatory or spacecraft, in CCSDS ASCII Calendar Segmented (ISO 8601). Example: 1988-01-18T17:20:43.123"
FITS_RES,DATE_OBS,time,SOHO,Not used,"DATE_OBS was DATE-OBS + EARTH_DT, i.e. time as if SOHO was at the center of the Earth.  For SDO same as DATE-OBS."
FITS_RES,DATE-END,time,FITS,"not used, DATE-OBS + EXPTIME",
FITS_RES,EXPTIME,float,,,"The duration of the observation, in seconds (floating point). "
FITS_RES,TELESCOP,string,FITS,,set to SDO
FITS_RES,INSTRUME,string,FITS,,"one of HMI, HMI_V, HMI_M, AIA, AIA_xx where xx is 1,2,3,4 for camera number or code for wavelength, TBD"
FITS_RES,OBJ_ID,string,SSW,,
FITS_RES,SCI_OBJ,string,SSW,,
FITS_RES,OBSERVER,string,FITS,,
FITS_RES,OBS_PROG,string,SSW,,
FITS_RES,WAVELNTH,float,SSW,,"HMI: 617.3, AIA: list options here."
FITS_RES,OBJECT,string,FITS,,
FITS_RES,T_OBS,time,MDI,MDI DSDS data uses T_OBS same as DATE-OBS - EARTH_DT,"Same as DATE-OBS + EXPTIME/2.0, but may be corrected past level-0.  I.e. DATE-OBS will be the onboard time but T_OBS may be corrected if onboard time dirfts."