Non-sidereal Tracking with LGSAO

Instructions for Non-sidereal Tracking with LGSAO

Set rotator mode to position angle mode
- For NIRC2, run the command rotate 0
- Diff tracking only works with the rotator in PA mode. It does not work in stationary or vertical angle mode.
Perform LGSAO acquisition, TT star and laser (Do not offset to object).
Start diff tracking IDL code as follows:
1. Start an xterm on k2aoserver as k2obsao
2. In the xterm -> cd arc/tss_track_1.0
3. Type the command enableTssTrack
4. Verify AOTSPROP is set to u2p
  - show -s ao aotsprop
  - xshow -s ao aotsprop &
5. Start an IDL session on k2aoserver. xterm -> idl
6. Type tss_track, rate = [RAR, DECR]
  - where RAR and DECR units are arsec/sec (i.e., value from JPL horizons divided by 3600).
  - For most solar system objects (other than neo), the rates will be less than 36 arcsec/hour (So the units for this tool will be less than 36/3600 = 0.01)
  - The sign for RAR and DECR is the same as the rates provided from JPL Horizons.
  - Notes:
    1. tss_track runs in an infinite loop applying incremental changes to the tip-tilt stage position via the keywords, AOTSDX and AOTSDY. You must stop it with cntl-C.
    2. FACSUM will still say AO control (even though this is a new mode of differential tracking)
    3. For a fast moving target, step up to the high rate in increments of 0.05 (arsec/sec)
Manually offset to target.
- e.g. en -4.0 -2.3
- offset should be accurate for the current time
Complete Science observations
To continue on the current target with different rates:
1. Cntl-C to stop the differential tracking
2. tss_track, rate = [RAR, DECR] (at the IDL prompt)
To setup on a new target or re-acquire the same target:
1. Cntl-C to stop the differential tracking
2. undoob at the IDL prompt
3. slew to new target
4. go to step 3F
To turn off diff tracking completely (end of night or end of diff track)
1. undoob at the IDL prompt
2. disableTssTrack and verify the keyword AOTSPROP is set to 0 or false.
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Updated: 30mar2010 after engineering tests (AC/TS)
         02aug2010 during 2nd Grundy/Roe use
         2012Feb03 During Mike Browns observing session (MK)
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