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On-Slit Guiding with Target

Method 1:

When your target is bright and relatively unsaturated in the Slitview Camera. 

  1. Choose "Center Balancing 2D" as a centroid algorithm. 
  2. Place the target on the reference position by clicking the target, and "Go R" button.
  3. Sample the PSF by clicking the "Take PSF" button. 
  4. dAX & dAY, dBX & dBY can be redefined for either AB nodding or On-Off nodding 
    1. Click "Select A-B & Guide Postion" if these were changed.
  5. Click "Set Reference & Ready to Guide".
  6. In the DTP window select "Move A" and then "Start AB Box".  --Watch guiding.


 

Off-Slit Guiding with guide star

Method 1: Unknown Offset (Target visible but faint) - click and guide.

Off-slit guiding when you see the target and the guide star in a slit camera view but don't know the offsets. 

  1. Choose "2D Gaussian (M) Fitting" as a centroid algorithm. 
  2. Place the target on the reference position by clicking the target, and "Go R" button.
  3. dAX & dAY, dBX & dBY can be redefined for either AB nodding or On-Off nodding 
    1. Click "Select A-B & Guide Postion" is these were changed.
  4. Click "Use Guide Position". 
  5. Click the guide star and "Sel G". Make sure the pink box moved on to the guide star.
  6. Click "Set Reference & Ready to Guide".
  7. In the DTP window select "Move A" and "Start Guide Box".  --Watch guiding.

Method 2: Known Offset in Slit_length (dSL) and Slit_width (dSW)

Off-slit guiding with known offsets in slit length and slit width between a target and a guide star.
  1. Choose "2D Gaussian (M) Fitting" as a centroid algorithm. 
  2. Click "Use Guide Position". 
  3. Enter nod position and guide offsets.
    1. dAX & dAY, dBX & dBY can be redefined for either AB nodding or On-Off nodding.
    2. Type dGSL and dGSW values in for guide star.
  4. Click "Select A-B & Guide Position".
  5. Take a single exposure on the Slit Camera View (SCV) package
  6. Click the guide star on the Image Window.
  7. Click "Go G" button and take a single exposure to see the guide star moved to the pink box.
  8. Target is now located on the reference position ("R").
  9. Click "Set Reference & Ready to Guide".
  10. In the DTP window select "Move A" and "Start Guide Box".  --Watch guiding.

 

Methods 3 and 4 are not available for 2014 Trimester 3.

Method 3: Known Offset in RA

Off-slit guiding with known offsets in RA & Dec between a (faint) target and a guide star.

 

 

Method 4: Known Offset in Pixels

Off-slit guiding with known offsets in Pixels between a (faint) target and a guide star.

  1. Choose "2D Gaussian (M) Fitting" as a centroid algorithm. 
  2. Click "Use Guide Position" in DTP. 
  3. Enter nod position and guide offsets.
    1. dAX & dAY, dBX & dBY can be redefined for either AB nodding or On-Off nodding.
    2. Type dGX and dGY values in pixels.
  4. Click "Select A-B & Guide Postion".
  5. Take a single exposure on the Slit Camera View (SCV) package
  6. Click the guide star on the Image Window.
  7. Click "Go G" button and take a single exposure to see the pink box moved to the guide star.
  8. Target is now located back on the reference position ("R").
  9. Click "Set R & Ready to Guide".
  10. "Move A" and "Start Guide Box".  --Watch guiding.