Information about the telescope such as the latitude, longitude, elevation, and the telescope limits in ha, declination, etc. are included. The telescope scale and the rotation of the focal plane are included. Details such as the pixel size and number of pixels of the CCD camera and the guider (if present) are also included.
It is encouraged that programs place all their telescope specific details into this file. In this way the same software can be used for any telescope. The picksym program may be used to extract these values.
Many of the of the values from ait.config are copied verbatim into every data (FITS) file.
OBSERVAT - string containing the name of the observatory OBSLAT - observatory latitude in decimal degrees OBSLONGH - observatory longitude in hours OBSELEV -observatory elevation in meters INSTRUME - string containing the name of the instrument parametersTELESCOP - string containing name of the telescope TELAREA - telescope collecting area in square centimeters TELSCALE - telescope scale in arc seconds per mm TELLIMN - North declination limit in decimal degrees TELLIMS - South declination limit in decimal degrees TELLIME - East hour angle limit in decimal degrees (usually negative) TELLIMW - West hour angle limit in decimal degrees TELLIMA - altitude limit in decimal degrees REFL - mirror reflectivity (numerical factor <= 1.0) CRA - telescope zero point error in ra in decimal degrees CDEC - telescope zero point error in dec in decimal degrees
SERVER - string describing the facilities used by tserver DATA_DIR - string containing path of data storage area REMOTE_SYS - internet address of machine to send data to REMOTE_DIR - string containing directory to which to send data
INSTROT - rotation angle of instrument tail piece in decimal degrees
DETECTOR - string containing the name of the detector chip CCDPIXSZ - pixel size along columns and rows in microns CCDSEC - string containing number of columns and rows CCDROT -CCD rotation angle with respect to instrument in decimal degrees CCDHAND - handedness of ccd +1 if (x,y)::(ra,dec) same handedness CCDDARKC - CCD dark current, electrons per sec per pixel CCDWELL - full well capacity, in electrons CCDREADN - CCD read noise, in electrons CCDGAIN - adus per electron BIAS_DRIFT - change in bias value in adus per degree C SHUTMIN -minimum shutter open time in seconds SHUTMAX - maximum shutter time in seconds
NFILTERS - number of filters in filter bolt FILTER00 - string with first field as filter name in bolt position #0 FILTER01 - string with first field as filter name in bolt position #1 etc.
GUSCALE - scale in arc seconds per mm GURANGE - guider size in mm GUBLOCK - vignetting size and blur in mm GUMAG - magnification factor over ccd GUROT - guider rotation angle (degrees) GUHAND - guider handedness GUPIX - guider pixel size column and row (microns) GUSEC - number of columns and rows in guider camera GUHOT - row column of `hot spot' for guider GUCEN - x,y loc of center of main field ccd
FOCUSDT -if temp changes by this much, refocus FOCUSCOEF - number of focus units change per degree C of tel temperature FOCUSNOMINAL - focus position at 0 C in focus units FOCUSSTEP - number of focus units to change between grid points telescope
SIM_OVERHEAD - time between moves in seconds SIM_SLEWRATE - how fast telescope can move in degrees per second SIM_DOMERATE - how fast the dome can move in degrees per second SIM_IMAGEOVERHEAD - how long it takes to read the ccd and store it SIM_GUIDEROVERHEAD - how long it take to acquire the star in seconds