The Tucana-Horologium association (Tuc-Hor), or Tucana Horologium moving group, is a stellar association with an age of 45 ± 4 Myr[1] and it is one of the largest stellar associations within 100 parsecs (330 light-years). The association has a similar size to the Beta Pictoris moving group (BPMG) and contains, like BPMG, more than 12 stars with spectral type B, A and F.[2] The association is named after two southernconstellations, the constellation Tucana and the constellation Horologium.
The group was at first not recognized as an individual group, but stars within the group were first assigned to the Great Austral Young Association (GAYA). Only later did it become clear that this complex is divided into three groups: the Tucana-Horologium association, the Carina association and the Columba association.[3]
^Torres, C. a. O.; Quast, G. R.; Melo, C. H. F.; Sterzik, M. F. (December 2008). "Young Nearby Loose Associations". Hsf2. 5: 757. Bibcode:2008hsf2.book..757T.