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LinkedIn published a post by the President of Mars Society, Switzerland
Pierre Brisson
The post arrived in one of LinkedIn's periodic emails about members.
The text under the title reads:
Working conditions on Mars' Moons for Human Settlement.
Arguments for the Moons: (1) The moons are more ...If anyone is interested I expect LinkedIn would provide more text for someone who logs in.
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LinkedIn sent a link to the post below:
Pierre Brisson
Président Mars Society SwitzerlandFollow
The interplay of mass and gravity makes Deimos the necessary gateway to living around Mars.
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Gravity on Mars is 0.38g, on Phobos 0.0005g, and on Deimos 0.0003g. It is because of this low gravity that Deimos is the only place where the components of an anchored space station, "Deimos-II," can be assembled. This station will recreate, through rotation, a minimum gravity (approximately 0.7g) allowing humans of all ages and physical conditions to live in an environment acceptable for their health. It is also on Deimos that the next station, "Eagle One," can be built, using almost all of the same components as for Deimos-II. This station will then be sent to a chosen site in an the "areostationary" orbit (geostationary for Mars) to be placed in rotation under far superior environmental conditions (no dust and better controlled access to energy).
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Masses:Eagle-One, like Deimos-II, must have a radius of 80 meters and rotate at 2.80 rounds per minute to recreate a gravity of 0.7g within its torus. This size and rotation speed are required because we need not to rotate too fast (Coriolis number < 2.5%) and we need to get a minimum head-to-toe gradient (< 0.15).
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The resulting mass from these constraints will be significant:
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Approximately 6,000 tons for the station with equipment and shielding outside the torus (structure alone 218 t, see details in my blog post, shielding 2920 t). The mass of the equipment is estimated by analogy with the ISS;
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52,730 tons for the radiation shielding (regolith shielding) of the torus;
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3,520 tons for the carbon fiber shell containing this shielding.
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That makes a total of 62,250 tons (100,000 t for the largest American aircraft carrier).
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The mass of the torus's shielding is paramount. This is due to the fact that a 2-meter-thick layer of regolith is required to protect the main living space, i.e. the torus, and that this torus, with a diameter of 6.5 meters (to allow for acceptable living conditions), needs a circumference of 500 meters to meet the requirements (gravity, head-to-toe gradient, Coriolis force) mentioned above.
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The first advantage of Deimos is that it offers the possibility of extracting all the regolith needed (and this without any risk of destabilizing the moon). It will "only" be necessary to contain the dust dispersion.
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The other advantage is its proximity to the areostationary orbit. The projection onto this orbit will be achieved with minimal energy expenditure (Δv < 90 ms) despite the mass involved, because the gravity differential is very small. Positioning Eagle One in this orbit will then allow us to work on Mars "as if we were there," since the orbit-to-surface time latency will be very low (0.114 s, round trip). If Deimos didn't exist, we would have had to dream it up
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illustration shows Deimos in the night sky of Mars as seen by Perseverance (NASA).
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Read: https://lnkd.in/evfAbiEA
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