1) Where did this object originally form and where has it resided in the Solar System since its formation 4.6 Billion years ago?
2) Has its original orbit(within the asteroid belt?) around the Sun been constantly altered by planetary perturbations etc?
3) What was its present orbit and period around the Sun prior to impact with the Earth?
4)How has its orbit evolved to put it on an Earth crossing orbit.
5) Have there been previous near misses in the past?
Signed INTERESTED and CURIOUS of TARBATNESS