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To summarize: this one is bigger than anything recent, but not as big as Skylab and its ilk back in the day.
Maybe this version tells the story more clearly: I have imposed a lower cutoff of 10 tonnes, half the CZ-5B core stage mass.pic.twitter.com/kA1PJxPqpd
Before the CZ-5B started flying there were NO "by design" uncontrolled reentries above 10 tonnes since 1990. DOS-6 (Salyut-7), STS-107 and Fobos-Grunt were all failures.
Was Mir not uncontrolled?
Correct: Mir was controlled. It had a Progress ship pushing down into the atmo at a specific location.
How long until we know where and when it will come dow
About a couple of hours after it actually does
Including STS-107 on that chart is kind of insulting to be honest. And it wasn't an uncontrolled re-entry. It was intentional, the impact point was the only uncontrolled part.
Was STS-107 really uncontrolled? It didn’t reenter due to a faulty stage or orbital decay but rather was deorbited just like an old space station or upper stage for example
It's a bit of a special case. It was a controlled deorbit but the debris landed far from the intended intact landing point, so in practice it had some of the characteristics of an uncontrolled reentry.
What is that F-G that reentered in like 2008?
The Russian Fobos-Grunt sample-return mission to Mars' moon Phobos. It also carried a Chinese orbiter. It failed after launch and before its departure burn for Mars, leaving it stranded in low Earth orbit. It reentered (uncontrolled) a couple of months later.
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