Mars Sample Return - Return Vehicle Size ??

I was wondering if there has been any discussion on the size of the rocket
that would lift off of Mars and return to earth a Mars sample ?? I'm
thinking this would have to be a fairly hefty launch vehicle containing
fuel, electronics, manoeuvring systems, a sample container with some mass of
sample and an Earth re-entry and landing system (ie. parachute).

All of this would first have to be launched to Mars, and landed safely
aboard some sort of lander/rover system...quite a lot of mass right there.
Then the sample would be stored aboard the rocket and launched at the
appropriate window. This rocket has to have enough power to reach Martian
escape velocity and power it's way towards earth.

Any guess as to approximate size ?? For example, I'm thinking a V-2 size
rocket would be way too big.....what about something the size of a AIM-54
Phoenix Missile ??...even that's pretty big....How do you get something
small enough to get to Mars, land safely, store enough Martian sample to
make it all worth while and yet with enough rocket power to get off of Mars
and back to Earth ???

Jeff Lerner
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