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by mapt 528 days ago
The size and shape alone says either rocketry or a piece of a jet turbine. And lacking any obvious plane crashes nearby...

M-V (Japan) Epsilon (Japan) Athena (US) Rokot (USSR) Soyuz-U (USSR) Soyuz-FG (Russia) Simorgh (Iran) ... many more

There are a comical number of options with parts that have a diameter somewhere in the 2.3-2.7m range.