Session parameters

Below follows a description of all parameters that can be set by the SET/OPTOPUS command, the commands which use these parameters and the default values. These parameters are stored in keywords and will be use as default values for subsequent OPTOPUS commands. If an OPTOPUS command the default value is not used the command will, in addition to actual OPTOPUS operation, also overwrite the setting of this parameter and hence will change the default value.

SET/OPTOPUS OLDEQ=1950.0 ! set the equinox
CREATE/OPTOPUS mydata mytable ? 2000.0 ! use another equinox
SHOW/OPTOPUS ! equinox value is now 2000.0

 

Table H.5: Command parameters

CREATE/OPTOPUS
Parameter	Description
OLDEQ	Equinox of RA and DEC coordinates of objects and guidestars in input table. Format must be: YEAR.yyyyy. Default value is "1950.0".
HOLES/OPTOPUS
Parameter	Description
CRA	Right ascension of the center of the Optopus plate. Input format must be: HH,MM,SS.sss. Default value is "00,00,00.000".
CDEC	Declination of the center of the Optopus plate. Input format must be: +/-DD,AM,AS.ss. Default value is "00,00,00.00".
ACFLAG	Character flag. Y or y (for yes) and N or n (for no) are the only values. If ACFLAG is set to Y (default) the automatic determination of the plate center enabled.
PFLAG	Character flag. Y or y (for yes) and N or n (for no) are the only values. If PFLAG is set to Y the automatic precession of the plate center enabled. Default is Y.
OLDEQ	Old equinox of the plate center (if not yet precessed). Input format must be: YEAR.yyyyy. Default value is "1950.0".
NEWEQ	New equinox of the plate center. Must be the same used to precess RA and DEC of objects and guidestars with the command PRECESS/OPTOPUS. Input format must be: YEAR.yyyyy. Default value is "2000.0".
PLOT/OPTOPUS
Parameter	Description
LABEL	Character string used to identify the plot. Default value is ``Optopus plate''.
EWFLAG	Character string. Y or y (for yes) and N or n (for no) are the only values. If EWFLAG is set to Y the EAST-WEST flipping of the plots is enabled. Default value is ``N''.
PRECESSION/OPTOPUS
Parameter	Description
NEWEQ	New equinox used to precess RA and DEC coordinates of objects and guide stars in input table. Must be the same as used to precess center coordinates with the command HOLES/OPTOPUS. Input format must be: YEAR.yyyyy. Default value is 2000.0.

 

 

Table H.6: Command parameters (cont.)

REFRACTION/OPTOPUS
Parameter	Description
DATE	Year, month and day of the observation. The permitted input formats are: YEAR,MONTH(number),DAY or YEAR.yyyyy,0,0 Default value is 1999.,12.,31.
EXTIM	Exposure time in minutes of Optopus plate. Default value is 0.0.
WRANGE	Wavelength range to optimize the corrections for atmospheric refraction. Input format must be: LAMBDA1,LAMBDA2 both in Ångstrom. Default value is: 3800,8000
SITSLT	Sidereal time interval during which a given Optopus plate will probably be used. Input format must be: ST1.ss,ST2.ss. Default value is: 00.00,00.00
OST	Optimal sidereal time for correction determinations, that is sidereal time for which the corrections for atmospheric refraction are calculated. Input format must be: ST.ss. Default value is: 00.00.
ASTFLAG	Character flag. Y or y (for yes) and N or n (for no) are the only values. ASTFLAG set to Y enables the automatic calculation of the optimal sidereal time for correction determinations. Default is Y.

=01 =11 =1992