Troubleshooting guide
Answer "y" to this last query; it will then print some numbers and other information to the screen.
It will conclude with:
The MOS dither script requires the slit center have zero offsets.
Clear the present offsets (i.e. set to zero)? (y/n) y
Answer "y" to this query. It will set the offsets (see cyan's telescope status screen) to zero, but it
will not move the telescope. The following output will be printed, and the script will be finished.
EXECUTING CLEAR OFFSET COMMAND:
/usr/local/uf2001May17/sbin/tcs2m "tele offset = zero"
2. Configure the spectral dither sequence using config.mos.dither.kp2m.pl.
• Set M_RPTPAT to the number of times to repeat the pattern.
• Set M_THROW, the distance in arcseconds between the A & B beams (which are symmetrically offset
about the telescope zero point−the final step of the previous script). This parameter must be correctly
set before moving onto the next step in this sequence.
3. Set up lock positions for the dither beams (A & B), ending in beam A. Type the following at the 2mguest
prompt:
2mguest@flmn-2m-1a{2} guide.define.abba.manual.beam.kp2m.pl
You should see the following output (some extraneous debugging info is excluded):
Before you start:
1) Make sure the MOS alignment stars are centered on their boxes.
2) The present position is defined as lock position 1.
3) The telescope has been guiding.
4) The telescope has zero offsets.
This script will define lock positions 2 & 3 as beams A & B,and place markers at each location.
Order of action:
1) Offer to clear the offsets, in case they're not already zeroed.
2) Turn off guiding.
3a) Offset telescope to beam B.
3b) Move guide and AOI boxes guide star in to beam B.
3c) Define position as pos3, and place marker.
4a) Offset telescope to beam A.
4b) Move guide and AOI boxes guide star in to beam A.
4c) Define position as pos3, and place marker.
5) Turn on guiding.
PA of slit on sky = 0.00
Telescope offsets in arcsec
---------------------------
Beam dra ddec
A 0.00 4.00
B 0.00 -4.00
FLAMINGOS@2.1-m, Ver. 2.39, 2011 May 13 Page 29 of 46