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.
What is the brand and model of the sextant?
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It is a Celestaire Astra 2.
Source: viewed image full size.
According to a conference paper from the 2019 the sextant is an Astra III.
The quote is:
The flight instrument was a Celestaire Astra III Professional hybrid brass/aluminum sextant, serial number 1183118.
answered Oct 14, 2018 at 21:03
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1$\begingroup$ According to HOLT, Greg N.; WOOD, Brandon A. Sextant Navigation on the International Space Station: A Human Space Exploration Demo. 2019. 42nd ANNUAL AAS GUIDANCE & CONTROL CONFERENCE: "The flight instrument was a Celestaire Astra III Professional hybrid brass/aluminum sextant, serial number 1183118"... even if, as you pointed out, it seems to me that the label says "ASTRA II". $\endgroup$ Nov 9, 2021 at 12:25
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1$\begingroup$ @AlessandroJacopson very interesting! Consider posting that as an answer, or editing it into this answer. That source and info deserves to be saved, and comments can go away. $\endgroup$ Nov 9, 2021 at 13:17
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$\begingroup$ @Innovine why does it say 3 in the paper? When it's clearly 2 in the real world. Maybe it's bashed together from different parts. $\endgroup$ Nov 11, 2021 at 17:17