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Gemini North primary mirror recoating will be delayed until mid-year. We will have a shorter shutdown now, for work on the acquisition and guiding unit, GMOS-N, and Altair, getting back to science on February 1. The semester schedule has been updated.
Using dedicated GMOS images (pre-imaging) for designing MOS masks has the advantages of being independent of the accuracy of any astrometric calibration and immune against proper motions of alignment stars or objects. However it also requires more telescope time, and requires time between the start of the semester and the start of the MOS observations for the pre-imaging to be taken and the mask to be designed.
ALTAIR (ALTtitude conjugate Adaptive optics for the InfraRed) is the facility natural/laser guide star adaptive optics system of the Gemini North telescope.
(1) Papers containing data from the Gemini telescopes (e.g. an ApJ paper) should include the following general acknowledgment as a footnote on the first page or in the last section before the references:
Click on the title of each article to open the PDF. Or view the whole issue here