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'Alopeke & Zorro Observing Strategies

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In speckle mode 'Alopeke and Zorro typically take 1-minute integrations comprised of 1000 images of 60 msec each using a 256x256 pixel (2.5") subarray which closely matches the isoplanatic patch size. Under good conditions it is possible to achieve diffraction-limited resolution (0.016" FWHM at 500nm and 0.025" at 800nm) with this configuration. Larger subarrays may be used for extended objects, but the performance will depend on the stability of the atmosphere.

It is recommended to request IQ-85, CC-70, WV-any, and BG-any conditions with airmass <1.5 for most speckle observations, and CC-50 if photometry is required.


In wide-field mode 'Alopeke and Zorro typically read out the full frame using the conventional amplifier at 1MHz. It is also possible to bin, read out a subarray, or use the EMCCD amplifier for faster readout, or read more slowly (0.1 MHz) for lower read noise. See the EMCCD page for the full list of readout options.

Gemini Observatory Participants