Only the primary star can be detected, via Doppler shifts or perturbations around the system's barycenter.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: Only the primary star can be detected, via Doppler shifts or perturbations around the system's barycenter. ### Response: .