Function screen_tca_conjunctions_parallel 

pub fn screen_tca_conjunctions_parallel(
    primary: &Satellite,
    secondaries: &[Satellite],
    window_start: JulianDate,
    window_end: JulianDate,
    miss_distance_threshold_km: f64,
    tca_options: TcaFinderOptions,
    pc_options: TcaPcOptions,
) -> Result<Vec<TcaScreeningConjunctionHit>, TcaError>

Parallel-screen a catalog and compute Pc for each threshold TCA.