Mechanical performance

Telescope limits:

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Zenith distance < 84 degrees

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-6 h < hour angle < +18 h (telescope East of pier)

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-18 h < hour angle < +6 h (telescope West of pier)

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There are no explicit declination limits.

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The fully-lowered windshield which sits on the dome lintel sets a further limit. Because of the asymmetry of the telescope, the limits are different east and west of the pier (see La Palma Technical Note 28).

Speed limits:

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Hour angle and declination: 1.0 degrees/s

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Dome rotation: 1.5 degrees/s

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Pointing accuracy: RMS residual of a global fit < 15 arcsec

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Tracking accuracy:

(unguided) < 1 arcsec in 3 minutes; < 3 arcsec in 10 minutes

(guided) < 0.3 arcsec

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Rotator positioning: < 0.2 arcsec over the whole field

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Offsetting accuracy: < 0.3 arcsec over 10 arcmin