The TW Hydrae association is a group of very young low-mass stars and substellar objects located approximately 25–75 parsecs (80–240 light years) from Earth.
They share a common motion and appear to all be roughly the same age, 10±3 million years old.
[1] As of 2017, 42 objects (in 23 systems[2]) are assigned to the association confidently, and several dozens — uncertainly.
[1] Some of the best studied members of this stellar association are TW Hydrae (nearest known accreting T Tauri star to the Earth), HR 4796 (an A-type star with resolved dusty debris disk; the most massive known group member), HD 98800 (a quadruple star system with debris disk), and 2M1207 (accreting brown dwarf with remarkable planetary-mass companion 2M1207b).
Included in the association is WISEA 1147, which is a brown dwarf.