There's also the 'Looking for Lurkers: Objects Co-orbital with Earth as SETI Observables' paper by James Benford, worth reading: https://arxiv.org/ftp/arxiv/pa

There's also the 'Looking for Lurkers: Objects Co-orbital with Earth as SETI Observables' paper by James Benford, worth reading: https://arxiv.org/ftp/arxiv/papers/1903/1903.09582.pdf https://arxiv.org/ftp/arxiv/papers/1903/1903.09582.pdf