Pointing Model Instructions
for MPG/ESO 2.2m

Taking Pointing Model Data at the 2.2 Telescope

Start up the telescope (instructions here). document.
In the w2p2ins workstation, from a free workspace, open an Xterminal and type the following commands:

Wait until the special TCS panel to take pointing model data appears.
In the panel, press the button labeled Cat.Select
It will pop up a catalog selection window. Type "/home/tcs/catal/red.cat" in the selection field, and hit Enter.
In the TCS Setup workspace, press the button Tracker Chip on the TCS Setup panel.
In the folder labeled Pointing Model TCS, you will find star maps with the stars contained in the catalog you just read in the pointing model panel, along with transparent drawings which divide the whole night sky in several sectors.
For each sector, do the following:

Put the transparent drawing on top of one of the starmaps (the one containing the current sidereal time on the horizontal axis), both, the map and the drawing with the south up.
Match the current sidereal time with the vertical axis of the transparent drawing.
Choose a star fairly close to the center of the sector.
Select the corresponding star in the catalog of the pointing model panel, either writing its name on the field "Search for catalog object" or using the buttons on the right side of the catalog.
Press the preset button on the ponting model panel an wait until the field telescope status is in Guide.
Press the acquire field button on the ponting model panel and wait for the field to appear on the tracker display (the right side monitor).
A bright star (the one you just presetted to) should show somewhere on the on the tracker display.
If the pick reference star panel is not open in the rightmost monitor, open it clicking on the TCS menu on the tracker display and choosing the option Pick Reference Star from the menu.
On the Pick Reference Star panel, click on the Pick Object button. The cursor should become a crosshair when on the tracker display. Click on the bright star.
Centre the star by:

On the pointing model panel type 1024 and 2048 in the corresponding fields, on the bottom part of the panel, right up of the button labeled Offset to Desired Position, to the right of the word Desired.
Press the button labeled Offset to Desired Position.
Wait until the Telescope Status field changes from Ofsinpr to Offset.

Acquire another field (instructions above). The bright star should be now at the center of the tracker CCD. You can check its position picking it up again, as described above and if the position is not close enough re-iterate the centering.
Once the star is close enough to the center of the tracker CCD, press the button STORE OFFSET on the pointing model panel.
Press the button Save Data as File... on the pointing model panel. If there is no name in the field to the right of the button, provide a suitable one (ask Roberto Castillo for a suitable name)
Mark with an erasable pencil the sector on the transparent drawing so you don't do it again.

Choose another sector on the drawing and repeat the process, until there are no more unmarked sectors.