The Tycho-2 Catalogue: a reference for astrometry and photometry. Combining the most modern and the oldest astrometric data - Commentary on: Høg E., Fabricius C., Makarov V. V., et al., 2000, A&A, 355, L27
A&A, 500 1 (2009) 587-588
Published online: 15 June 2009
DOI: 10.1051/0004-6361/200912207