There are 2 ways to perform a "coma free" pointing offset moving the AdSec
- using the TCS GUI
- using the ARGOS terminal
How to perform a pointing offset using the TCS GUI
Note: a 1" Rx or Ry movement corresponds to 0.22" movement on-sky
- Login on obs[x] as LBTO. See UsefulLoginInfo
- Start OSSGUI right (or left)
- Click on the icon of the M2 (right or left) to open the hexapod command window
- Write now the 6 numbers in the Absolute position line: this is where you need to move back in case you get lost
- Write zero in the 6 fields of Move Relative line.
- To perform a tip=10'' of X pointing offset write X=+0.505mm and RY=+98" (values calibrated from Zemax model). Click on Set Reference and then on Move Relative.
- To perform a tilt=10'' of Y pointing offset write Y=-0.505mm and RX=+98". Click on Set Reference and then on Move Relative.
Always click on Set Reference first and then on Move Relative
How to perform a pointing offset using the ARGOS terminal
- Open an ARGOS terminal and type:
from argos.arbitrator.tcs.hexapod_controller import Pointing
offset= Pointing.fromNumPyArray(np.array([xxx, yyy]))
Remember that the
offsets are expressed in arcsec on-sky.
- 04 Nov 2014