TW Hydrae association

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The TW Hydrae association is a group of approximately thirty very young stars located 50 parsecs[1] from Earth that share a common motion and appear to all be roughly the same age, 5-10 million years old. 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.[2][3][4]


  1. ^ Mamajek (2005). "A Moving Cluster Distance to the Exoplanet 2M1207b in the TW Hydrae Association". The Astrophysical Journal. 634 (2): 1385–1394. Bibcode:2005ApJ...634.1385M. arXiv:astro-ph/0507416Freely accessible. doi:10.1086/468181. 
  2. ^ Newcomb, Alyssa (20 April 2016). "Lonely Planet Unattached to a Star Found in Deep Space". ABC News. Retrieved 21 April 2016. 
  3. ^ "Lone Planetary-Mass Object Found in Family of Stars". NASA. 19 April 2016. Retrieved 21 April 2016. 
  4. ^ Kennell, Joanne. "Astronomers Spot a Lonely Planet-Like Object Floating Freely in Space". The Science Explorer. Retrieved 21 April 2016.