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Astronaut Alexander Gerst is testing an hand-held sextant on the ISS in the context of the experiment Sextant Navigation for Exploration Missions, see picture below. NASA Image: ISS056E049856 - ESA astronaut Alexander Gerst calibrates and operates the Sextant Navigation device that is testing emergency navigation methods such as stability and star sighting in microgravity for future Orion exploration missions.

What is the brand and model of the sextant?

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It is a Celestaire Astra 2.

Source: viewed image full size.

enter image description here

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