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Data entry

Enter the observing aperture coordinates (arcsec). The default values are determined by the telescope/focal station combination.

2=to: 2!:}Format: APERTURE x y

2=to: 2!:}Example: APERTURE 10 20

Enter the name of a source catalogue to be used as a list of target positions. Standard VMS syntax, defaulting to the current directory with a .CAT extension.

2=to: 2!:}Format: CATALOGUE <filename>

2=to: 2!:}Examples: CATALOGUE MANX (uses MANX.CAT in the current working directory)


Specify the observing configuration. The current list of telescope and focal station combinations is given in Section 4.1.

2=to: 2!:}Format: CONFIGURATION <telescope> <focal_station>

2=to: 2!:}Examples: CONFIG INT CASS

2=to: 2!:} CONFIG NONE

Enter the epoch of observation (as a year number, to an accuracy of 3 decimal places, or in DEC standard format). The default is the current date and time.

2=to: 2!:}Format: DATE <date>

2=to: 2!:}Examples: DATE 1994.256

2=to: 2!:} DATE 21-DEC-1995

2=to: 2!:} DATE 25-DEC-1999:22:00:00

Reset the relevant configuration parameters to their default values. The keywords covered by this command are: DATE, APERTURE, MAGNITUDE, NUMBER, SEPARATION and ALL. The default (assumed if no parameter is given) is ALL.

2=to: 2!:}Format: DEFAULT <configuration>

2=to: 2!:}Examples: DEFAULT MAGNITUDE

2=to: 2!:} DEFAULT

Set the GKS device to be used for plotting. To get a list of workstation names, type DEVICE followed by ? at the _GKS Device name:prompt (not DEVICE ?).

2=to: 2!:}Format: DEVICE <GKS_device_name>

2=to: 2!:}Example: DEVICE XWINDOWS
The most commonly-used device names are:

Pericom graphics terminal.
Canon laser-printer (landscape mode). Note that a device-name of
CANON_L;filename causes the plot output to be written to a file called filename rather than the usual CANON.DAT. Canon graphics can be printed on La Palma using the commands WHT_GLASE and INT_Glase.
Canon laser-printer (portrait mode; output filename as above).
Postscript (landscape mode). Again, specifying POSTSCRIPT_L;filename generates output in filename, rather than the generic GKS_72.PS. Postscript output can be printed on La Palma using the command WHT_PLASE.
Postscript (portrait mode; output filename as above).
X-window on VaxStation, Sun or X-terminal. Note that to get a window on a remote workstation, the command XDISPLAY should be issued at the $ prompt before starting GSS. This is a Starlink command, and to use it you will need to execute the appropriate login procedure by typing (or including in your LOGIN.COM file) the command @SSC:LOGIN.

Set the bright and faint V magnitude limits. The default values are the standard values for the configuration. The allowed range is 5 - 19 (there are no stars in the GSC with magnitudes outside these limits).

2=to: 2!:}Format: MAGNITUDE Vmin Vmax

2=to: 2!:}Example: MAGNITUDE 12 15

Set the maximum number of guide stars to be selected at a given position angle. Overrides system default (50 for NONE; 10 for all other configurations).

2=to: 2!:}Format: NUMBER <max_number>

2=to: 2!:}Examples: NUMBER 45

Input the sky position angle, as given to the relevant telescope control system, in degrees (0o - 360o) or specify that guide stars be found for all possible position angles using the keyword ANY. The latter option is meant for small fields, where there may only be a limited choice of guide stars, in order to allow a sensible choice of rotator PA. It is disabled for WHT and INT Prime and for the JKT Wide-Field Camera.

2=to: 2!:}Format: ROTATOR <angle> or

2=to: 2!:} ROTATOR ANY

2=to: 2!:}Examples: ROTATOR 180

Set the minimum separation of guide stars (arcsec). Overrides system default (5 arcsec for telescope configurations; zero for NONE).

2=to: 2!:}Format: SEPARATION <min_separation>

2=to: 2!:}Example: SEPARATION 2

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Next: Actions Up: Commands Previous: Commands

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Mon Mar 1 17:52:09 GMT 1999