Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
center-to-center distance of 6,900 to 46,300 km involves which orbital period?

### Inputs:
table_name: table, columns: ['orbit', 'center-to-center distance', "altitude above the Earth's surface", 'Orbital period', 'specific orbital energy']

### Response:
SELECT Orbital period FROM table WHERE center-to-center distance = 6,900 to 46,300 km