Given the data we have so far the meteorite that fell in Russia may had a mass of 1/20 of the asteroid 2012 DA14 (the one that was going to pass near the Earth) or more.
Fun thing:
I go to wikipedia for some info, click on airburst in the impact event page and end in:
"Airburst is a 2001 Mac OS game developed by Strange Flavour and published by Freeverse."







