Kalpana One design (was Rotating space colonies)

--- In spacesettlers, joe wrote:

> Apophis? IIRC, the delta-V from that is much greater than for some
> other asteroids. Remember, it's not the distance that matter so much
> as the change in velocity needed to move material from it into Earth
> orbit (or wherever you want to use it).

How does the delta-V from Apophis compare to the Moon? What sort of
asteroid is Apophis? What resources are available from it?

Well, I can probably look those last two up.

Then again, maybe not. It matters if it's a snowball, hunk of iron,
or carbon-rich lump.