  We analyse a megasatellite settlement built from Ceres materials in high
Ceres orbit. Ceres is selected because it has nitrogen, which is necessary for
an earthlike atmosphere. To have $1 g$ artificial gravity, spinning habitats
are attached to a disk-shaped megasatellite frame by passively safe magnetic
bearings. The habitats are illuminated by concentrated sunlight produced by
planar and parabolic mirrors. The motivation is to have a settlement with
artificial gravity that allows growth beyond Earth's living area, while also
providing easy intra-settlement travel for the inhabitants and reasonably low
population density of 500 /km$^2$. To enable gardens and trees, a 1.5 m thick
soil is used. The soil is upgradable to 4 m if more energy is expended in the
manufacturing phase. The mass per person is $10^7$ kg, most of which is lightly
processed radiation shield and soil. The goal is a long-term sustainable world
where all atoms circulate. Because intra-settlement travel can be
propellantless, achieving this goal is possible at least in principle. Lifting
the materials from Ceres is energetically cheap compared to processing them
into habitats, if a space elevator is used. Because Ceres has low gravity and
rotates relatively fast, the space elevator is feasible.
