Hi,
to all the above discussion you must consider that satellites, debris and other orbiting objects are not necessarily orbiters, and as already pointed out, even if you consider something built like a tank the impact of a hyper velocity mass is likely well capable of knocking an orbiting "tank" out of its orbit, tumbling and spinning across space intersecting many other orbits.
I believe that the articles referenced also indicate that meteor showers and meteor storms, as well as orbiting debris, can a threat to orbiting objects. Spraying the space above a planet with at least 3.6million "impactors" over a given period, especially considering that these "impactors" would all have a uniform mass of about 0.1kg each, of time would likely be considered a meteor shower on steroids, when compared to a naturally occurring meteor shower where the particles can range in size down to dust flakes and whose density may be measured on the order of tens of thousands or the low 100,000s.
If 3.6million particles are not considered enough, other factors to consider, in addition to just increasing the number of attacking ships, is the fact that each of those cruisers referenced from Mongoose Traveller's High Guard is that each ship also carries (I believe) 12,000 barrels of Sand for the Sand Casters and 2880 "torpedoes" (which appear to be 2.5 dton weapons in the Mongoose Rules). If you want you could also through all or part of these along a vector toward the planet as well. (I'll have to check later to see what total mass of "impactors" a "torpedo' might carry.)
Beyond this, also consider that objects in orbit do not represent fixed points in space, but rather they are also in motion. Also, as an experiment, if we were to draw a set of circles representing a planet and the different range bands of orbits for typical satellites, and then draw a set of lines across these rings, with the lowest being tangent to bottom of the lowest orbit band and the highest being tangent to the top of the most densely populated orbit band, you'll see that each "impactor" would cross all range bands to some extent and many "impactors" would cross many of these range bands twice (on the entrance side and then on the exit side).
Because of factors like these, the "impactors" should have a fair bit greater chance of hitting orbiting objects than just looking a objects moving through a single volume of space at a single orbit band.
to all the above discussion you must consider that satellites, debris and other orbiting objects are not necessarily orbiters, and as already pointed out, even if you consider something built like a tank the impact of a hyper velocity mass is likely well capable of knocking an orbiting "tank" out of its orbit, tumbling and spinning across space intersecting many other orbits.
I believe that the articles referenced also indicate that meteor showers and meteor storms, as well as orbiting debris, can a threat to orbiting objects. Spraying the space above a planet with at least 3.6million "impactors" over a given period, especially considering that these "impactors" would all have a uniform mass of about 0.1kg each, of time would likely be considered a meteor shower on steroids, when compared to a naturally occurring meteor shower where the particles can range in size down to dust flakes and whose density may be measured on the order of tens of thousands or the low 100,000s.
If 3.6million particles are not considered enough, other factors to consider, in addition to just increasing the number of attacking ships, is the fact that each of those cruisers referenced from Mongoose Traveller's High Guard is that each ship also carries (I believe) 12,000 barrels of Sand for the Sand Casters and 2880 "torpedoes" (which appear to be 2.5 dton weapons in the Mongoose Rules). If you want you could also through all or part of these along a vector toward the planet as well. (I'll have to check later to see what total mass of "impactors" a "torpedo' might carry.)
Beyond this, also consider that objects in orbit do not represent fixed points in space, but rather they are also in motion. Also, as an experiment, if we were to draw a set of circles representing a planet and the different range bands of orbits for typical satellites, and then draw a set of lines across these rings, with the lowest being tangent to bottom of the lowest orbit band and the highest being tangent to the top of the most densely populated orbit band, you'll see that each "impactor" would cross all range bands to some extent and many "impactors" would cross many of these range bands twice (on the entrance side and then on the exit side).
Because of factors like these, the "impactors" should have a fair bit greater chance of hitting orbiting objects than just looking a objects moving through a single volume of space at a single orbit band.