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'Alopeke Observing Strategies

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In speckle mode 'Alopeke typically takes 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.


In wide-field mode 'Alopeke typically reads out the full frame using the conventional amplifier at 1MHz which yields a readout time of ~1 second and read noise of ~6 electrons. It is also possible to 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