If objects the size of sand grains can produce bright meteors and objects a few cm in size can produce a bright fireball - just how bright would an object 10km be as it passed through the atmosphere?? Maybe thousands or hundreds of thousands of times brighter than the Sun.
What would be the unfortunate effects of being close enough to see it streak through the sky. And I wonder what kind of damage it would do before it even hit the ground???
Disaster movies always show a feeble fireball followed by a long smoky trail.