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Can I pick the orientation(s) of the grism?

April 26, 2017grism Orientation pick

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Can I pick the orientation(s) of the grism?

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Yes. The grism has 872 possible grism angles selectable. In the target list you should specify the PA on the sky along which you would like the dispersion to run. If you wish to do spectroscopy in crowded fields, using more than about 6 grism exposures, then it is advisable to let the planning software choose random grism angles (to improve observing efficiency).