# Is the way I've spun up an asteroid structurally realistic?

In my world, I have an asteroid station that was spun up to produce artificial gravity.

Characteristics:

• The asteroid is treated as cylindrical, with a radius of 1.5km and a length of 5km. Assuming a density of 2g/cm3 at the behest of Wikipedia, this produces a mass of 70,680 metric tons, not accounting for any mass lost to the station built into the rock. Materially speaking, the asteroid is solid and rocky.
• The asteroid is spinning at around 66 meters per second/0.4rpm, to produce 0.3g of artificial gravity.

Methodology

The asteroid was not spun up without preparation - that would obviously cause it to fly apart. My current explanation revolves around coating most of the surface in two meters of steel, with 250m radius openings left at each "pole," one for a docking bay and one for radiators. The station inside the rock has been reinforced to one-g construction standards to prevent cave-ins and the like.

Question

Is this setup structurally realistic, or would this lead to a broken asteroid and lots of dead people? If no, is it possible with stronger materials?

• Working on an answer, but for starters there are six zeros missing in the mass provided. Oct 23, 2020 at 3:41
• @KerrAvon2055 checks math Yup, still can't count. Thanks for catching that. Oct 23, 2020 at 4:02
• I'll maybe start working on an answer later. But my gut is telling me the massive steel walls weaken the structure and will break themselves apart under the load. If carbon nanotubes are unavailable, I'd be looking more at differening steel meshes for my outer reinforcements. A layer of fine woven material (like a kevlar fabric), a layer of 1mm wire mesh , a layer of 3mm wire mesh, hex grid of 10mm steel wire under tension, and radial 50mm steel wire bands holding it all together.
– Ash
Oct 23, 2020 at 4:12
• is there any particular reason for why you encapsulated an asteroid instead of building an o'neil cylinder with all of that steel? IIRC contemporary material strength should be enough to construct a cylinder of same size. Oct 23, 2020 at 19:55
• @DarthBiomech The backstory is basically that the asteroid was randomly captured into the Earth-Moon L2 point right around the time space colonization began, and it was colonized in null-g due to a lack of free infrastructure to build a station from scratch. The spin was commissioned thirty years after the fact. This station is actually an exception - all the other big ones are O'neil scale structures. Oct 24, 2020 at 0:10