GrumpyCatFace wrote:
That's what I said. You can sort of get into an elliptical orbit if you are traveling at about 24,000 km/h. What you just gave shows the lowest circular orbital velocity at around 27,000 km/h.
I very much doubt an ICBM at apogee is going much faster than 20,000 km/h since it would risk just going into orbit.
So if you have a platform in orbit, it's already going to be upwards of 30,000 km/h. But that sort of makes the problem easier as long as you have warning of a launch and the platform is in range of the ICBM's projected apogee.
The bigger problem is that these ICBMs are mostly flying across the arctic and it's not like you can just park up there like you can near the equator. You'd need lots of platforms distributed in various polar orbits so that one or two of them are always covering the polar region.