To summarize, the lowest possible sustained circular orbits are at of ... - dofaq.co
kármán line

To summarize, the lowest possible sustained circular orbits are at of ...

wikipedia - 13 Oct 2021
To summarize, the lowest possible sustained circular orbits are at of order 125 km altitude, but elliptical orbits with perigees at 100 km can survive for long periods. In contrast, Earth satellites with perigees below 80 km are highly unlikely to complete their next orbit. It is noteworthy that meteors (travelling much more quickly) usually disintegrate in the 70–100 km altitude range, adding to the evidence that this is the region where the atmosphere becomes important.

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