I should have read the article further. It's hypothesized that the belt contained as much as an earth-mass of material. But overall, it never coalesced into a planet due to being disturbed by Jupiter's gravity.
It'd be a tiny itty bitty planet. All the asteroids together are only 4% of the Moon's mass. http://en.wikipedia.org/wiki/Asteroid_Belt#Formation
I don't think HeeChee references are that obscure.
It's no wonder the zombie outbreak started in China.
At which point they will eat their children.