Old OSMOS Long Slit Acquisition Procedure

For general information, here is the (now old) recipe for acquisition with a single slit:

1. Point to the desired field
2. Image through the slit to measure its projected position on the detector [make sure the disperser is not in the beam]
3. Acquire a guide star and start guiding
4. Obtain an image of the field
5. Measure the required offset to move the target into the slit
6. Stop guiding and offset the guider the desired amount
7. Move the telescope so the guide star is back in the box
8. If desired, take an image to verify that the offset was successful
Here are some suggestions to make this process more efficient:
- Use 1k ROI for the slit image and acquisition image (see Detectors for more information)
- Update (or check) the telescope pointing beforehand with a bright star so that objects fall within a few arcseconds of the slit
- Do not forget to switch back to the appropriate ROI for spectroscopy.
The image of the long slit on the detector is repeatable at the level of one micron or better (vs. 15 micron pixels) and therefore moving the slit in and out of the beam does not impact acquisition. The wavelength solution is similarly unaffected if the disperser wheel is moved.

Updated: 2010 Sept 15 [pm]