Transatmospheric orbit

Movement around a celestial body that remains below its Karman line

A transatmospheric orbit (TAO) is an orbit around a celestial body in which the perigee of the orbit intersects with the defined atmosphere. Transatmospheric Earth orbits generally use the FAI defined Kármán line of 100 km altitude to differentiate between transatmospheric Earth orbits or low Earth orbits but altitudes such as the U.S. defined 50 mi line may be used. Such orbits are subject to significant atmospheric drag, causing rapid orbital decay if left unchecked.

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