Research from the RAdial Velocity Experiment (RAVE) at the Australian Astronomical Observatory, headed by Quentin Parker, was the first to quantify the nature of the group, though astronomers had known of its existence for some time.
The research conducted by the RAdial Velocity Experiment (RAVE), led by Quentin Parker at the Australian Astronomical Observatory, provided the first quantitative analysis of the group's characteristics.  Astronomers had previously known about its presence but lacked a detailed understanding of its nature.