The CZ-5B-Y1 core stage is in a 155 x 366 km orbit, and is expected to reenter around May 11. At 17.8 tonnes, it is the most massive object to make an uncontrolled reentry since the 39-tonne Salyut-7 in 1991, unless you count OV-102 Columbia in 2003.
Actually it may be even heavier, the official figure given for the LM-5 1st stage during the Dec. 2019 flight was 20.6 t. There are reports of slight changes to this flight's stage to lighten it up, but I doubt the change would be big. https://forum.nasaspaceflight.com/index.php?topic=44114.msg2030342#msg2030342 …
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core stage lost ~400kg https://www.jiemian.com/article/4338653.html … (and while not relevant in this context, 4 boosters lost ~700kg combined)
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Hmm, can't use google translate on a jpg... would you mind translating the 2nd and 3rd lines in the first table for me? 142.8, 165.3, 29.1, 0.2 and 156.6, 186.9, 36.0 ?
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2nd line is propellant mass (probably the specific amount for the LM-5 Y3 flight and not the maximum mass) - I suspect "DT3" is for the 2nd stage RCS but I'm not sure. 3rd line is (gross) mass of stages at liftoff.
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