Changes
SHOC
,/* FITS Header Keywords */
The FITS information is mostly drawn from the Andor camera. We have added additional keywords added to contain information on target (which can be entered by the user under the "advanced" tab in the web interface), the GPS settings, and from the telescope (when available -- currently only for the 74 inch). We have retained the raw state of Andor's keywords in order keep things as simple and straightforward as possible.
{| border="1" cellpadding"5" cellspacing="0" class="wikitable"
!|Keyword and comments (example)
!| Notes
|-
|AVGFCTR = 1 / Averaging factor
|-
|FRMCNT = 1 / Frame Count
|-
|USERTXT1= ' ' / User text
|-
|USERTXT2= ' ' / User text
|-
|USERTXT3= ' ' / User text
|-
|USERTXT4= ' ' / User text
|-
|DATE = '2015-04-17T14:34:28' / file creation date (YYYY-MM-DDThh:mm:ss)
|-
|FRAME = '2015-04-17T14:34:28.000' / Start of Frame Exposure
| This comment is incorrect. It is the time at the ''end'' of the first frame for internal mode, and the time "start" is pressed for external triggering mode.
|-
|ESHTMODE= 0 / Electronic Shuttering Mode
| This is the last keyword of those coming straight from the Andor Ixon camera.
|-
|AIRMASS = 'NA ' / The airmass (sec(z))
| Starting with this keyword, everything here and below has been added in the SAAO software. Airmass comes from the TCS.
|-
|DATE-OBS= '2015-04-17T14:34:26.446239' / The time the user pushed start (UTC)
| Note that during external triggering mode, this does not correspond to any specific timing for the images. The camera started waiting at this time for a trigger from the GPS.
|-
|DOMEPOS = 'NA ' / The dome position
| Read from the TCS.
|-
|FILTERA = ' ' / The active filter in wheel A
|-
|FILTERB = ' ' / The active filter in wheel B
|-
|GPS-INT = ' ' / GPS trigger interval (msec)
| Set by the user on the GPS tab of the web interface. This is the cadence at which GPS pulses are sent. Each pulse triggers a readout on the camera.
|-
|GPSSTART= ' ' / GPS start time (UTC; external)
| Set by the user on the GPS tab of the web interface. This is the time that the first GSP pulse was sent, which corresponds to the readout of the first GPS image. We typically toss the first two images in a GPS triggered sequence because the first is nothing (before the first pulse) and the second has slightly inaccurate timing.
|-
|HA = 'NA ' / The telescope hour angle
| Read from the TCS.
|-
|INSTANGL= 'NA ' / The instrument angle
| Read from the TCS.
|-
|HA = 'NA ' / The telescope hour angle
| Read from the TCS.
|-
|INSTANGL= 'NA ' / The instrument angle
| Read from the TCS.
|-
|INSTRUME= 'SHD ' / The SHOC instrument name
|-
|INSTSWV = '1.0 ' / The SHOC software version
|-
|OBJDEC = ' ' / Declination of object
| From the user-entered information on the advance tab of the web interface.
|-
|OBJECT = ' ' / IAU name of observed object
| From the user-entered information on the advance tab of the web interface.
|-
|OBJEPOCH= ' ' / Object coordinate epoch
| From the user-entered information on the advance tab of the web interface.
|-
|OBJEQUIN= ' ' / Object coordinate equinox
| From the user-entered information on the advance tab of the web interface.
|-
| OBJRA = ' ' / Right ascension of object
| From the user-entered information on the advance tab of the web interface.
|-
|OBSERVER= ' ' / Observer who acquired the data
| From the user-entered information on the advance tab of the web interface.
|-
|OBSTYPE = ' ' / Observation type
| From the user-entered information on the advance tab of the web interface.
|-
|TELDEC = 'NA ' / The telescope declination
| Read from the TCS.
|-
|TELESCOP= '40in ' / The telescope name
|-
|TELFOCUS= 'NA ' / The telescope focus
| Read from the TCS.
|-
|TELRA = 'NA ' / The telescope right ascension
| Read from the TCS.
|-
|ZD = 'NA ' / The telescope zenith distance
| Read from the TCS.
|-
|END
|-
|}
====FITS Header Keyword Conversion====
