Well, that’s good and nuts. Skylab was 150 tons, btw.
Chelyabinsk Meteor: A Wake-Up Call for Earth
By Elizabeth Howell
[snip] “The asteroid was about 17 meters [56 feet] in diameter and weighed approximately 10,000 metric tons [11,000 tons],” Peter Brown, a physics professor at Western University in Ontario, Canada, said in a statement. “It struck Earth’s atmosphere at 40,000 mph [64,370 km/h] and broke apart about 12 to 15 miles [19 to 24 km] above Earth’s surface. The energy of the resulting explosion exceeded 470 kilotons of TNT.” [/snip]
https://www.space.com/33623-chelyabinsk-meteor-wake-up-call-for-earth.html
Whoops, Mir was 150 tons (it was built a bit at a time), Skylab was 77 tons.