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You have it correct, but you are looking at a very narrow range of ISP. The BepiColombo mission to mercury uses an ion thruster with a ISP of 4,200 seconds(41,202 M/s). The same formula yields a mass ratio of 11.325. The NEXIS ion thruster can achieve 8000 seconds (78,200 m/s) The European DS4G innovative thruster manages 19,300 seconds (188,200 m/s) ...

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