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The figure below shows the telescope limits for the Keck telescopes. In the regions where an elevation limit of ~35° is shown, the telescope hits the Nasmyth deck. Note that this is a problem in the South and West for Keck II, while for Keck I it is more of a problem in the North and East.
Specific limits for the two telescopes:
| Telescope | Azimuth range | Elevations accessible |
|---|---|---|
| Keck I | 5.3° to 146.2° | 33.3° to 88.9° |
| Elsewhere | 18° to 88.9° (unvignetted), 0° to 18° (vignetted) | |
| Keck II | 185.3° to 332.8° | 36.8° to 89.5° |
| Elsewhere | 18° to 89.5° (unvignetted), 0° to 18° (vignetted) |
Stable guiding cannot be guaranteed for targets transiting at elevations higher than ˜85°.
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