Pointing Origins
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Pointing Origins |
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The telescope's pointing origin is the physical position within the focal plane corresponding to the currently selected right ascension and declination. Having different pointing origins allows you to specify that a certain object should be placed in the center of the DEIMOS detector field-of-view rather than within the field-of-view of the offset guider, for example. The name of the current pointing origin is always displayed in the lower right corner of the Facilities Summary (FACSUM) window. The pointing origin can be changed by the OA or by using the poname command on polo.
| Name | Description | XIM [mm] |
YIM [mm] |
XCCD [px] |
YCCD [px] |
|---|---|---|---|---|---|
| REF | Center of the pickoff mirror as seen on the DEIMOS guider (pixel 512,800) | -74.12 | 100.00 | TBD | TBD |
| TVCENTER | Center of the DEIMOS guider (pixel 512,512) | -73.25 | 141.25 | TBD | TBD |
| Image | Nominal position for imaging; puts object near the center of CCD 3 | -95.20 | 202.10 | TBD | TBD |
| Slit | Nominal position for longslit spectroscopy; puts object on the longslit near the center of CCD 3 | -94.70 | 195.80 | TBD | TBD |
| DEIMOS | Center of the DEIMOS slitmask; use this pointing origin for slitmask observing | -2.00 | 196.00 | TBD | TBD |
| Mira | Pointing origin used for running Mira | -139.20 | 201.10 | TBD | TBD |