Guide Star Catalog
revised 18/09/01
The Guide Star Catalog is used to pick up suitable
guidestars while observing through the GSS interface.
Using GSS directly:
- Telnet session to lpvs3 (user GSS)
- Specify telescope and focal station
- $>GSS
- GSS> CON WHT CASS
- GSS> ROT {sky pa}
- GSS> MAG 6 16
- GSS> SEA hh mm ss dd mm ss equinox
- GSS> EXIT
- $> TYPE OUTPUT.GS
An easier way to query the catalog is though the script @gs:
- Telnet session to lpvs3 (user GSS)
- Specify telescope and focal station
- @gs
- input rotator, ra, dec & equinox
- input aperture offsets, it any
The advantage using the script is that it will accept many
different formats of input coordinates:
180 12 30 43 28 13 41 j2000
180 12 30 43.000 +28 13 41.00 j2000
180 12 30 43 28.00 DEC 028 13 41.00 j2000
The last two rows would not be accepted by GSS, but are ok for @gs
They are what you get if you cut-paste with the mouse
- Coordinates from the TCS catalogue (out term)
- Telescope coordinates from the TCS infodisplay
The autoguider coordinates for the found guidestars must be
passed using the apprirate command, i.e. 'autoxy','guide on
pixel', 'prag', etc. Cass AG probe on the wht can be moved
from the TO terminal using the 'toPprag' command:
- Logon to the observing system (lpvg,lpvf) as observer. Do
NOT run observing system when asked!.
- Start ICL by typing $ icl
- Load the command: ICL> load [.vsd]to_prag
- Now, ICL>to_prag 40000 50000 will move the probe
19/07/2001:Added the new option "OWN" to the instrument list
of the WHT. The script now automatically subtracts 90 degs to
the rotator in this case and also for the "AUX" option.
In summary: use @gs for anything but STJ, for which "GHRIL"
has to be used (despite of the TCS 'instrument own' mode).
(Use OWN for Sauron and PlanNebulaSpectr)
I don't know about CIRSI at the WHT; whenever it comes, try
and let me know.