The Tycho-2 Catalogue
Information and Links
- in inverse chronological sequence
Last updated 26 January 2010
Author Erik Høg
Frequently asked questions, with answers.
Please send your comment or questions to
Comments and updates will be placed here.
an astrometric and photometric reference catalogue
of the 2.5 million brightest stars on the entire sky.
an area of the sky with Hipparcos and Tycho stars.
25 January 2010:
Celebrating ten years since the release of the
Tycho-2 Catalogue, a mail was widely distributed:
Mail on ten years Tycho-2.
11 February 2002:
Catalogue with results for 105259 components,
astrometry and two-colour photometry:
The Tycho Double Star Catalogue.
Astron. Astrophys., 384, 180-189 (2002 March II)
16 Mar. 2000:
E. Høg, C. Fabricius, V.V. Makarov, S. Urban, T. Corbin, G.
Wycoff, U. Bastian, P. Schwekendiek, and A. Wicenec in:
Here the final version of the paper, the same as on the CD-ROM.
Tycho-2 was released on 8 Feb. 2000, and widely distributed on a
CD-ROM containing the catalogue and documentation.
Included was, e.g.,
Guide to the Tycho-2 Catalogue
as guide.pdf which is also available as .ps:
Tycho-2 is available at CDS where the 500 Mbyte catalogue file
is divided into smaller files. Stars in fields may be
extracted at CDS in
VizieR , at
ESA, and at
See also the readme.htm, or Sect. 1 in the guide.pdf or guide.ps.
The Hipparcos and Tycho Catalogues, 1997, ESA SP-1200, 17 Volumes -
with 14 contributions by C. Fabricius, E. Høg, V.V. Makarov.
--- See HIPPARCOS
Erik Høg homepage
April 1998: Letter to the editor of Astron. Astrophys.
The Tycho Reference Catalogue (TRC). The catalogue
contains high-quality positions
and proper motions for nearly one million stars.
The median accuracy of the TRC position component is 40 mas at
The median accuracy of the proper motion is about 2.5 mas/yr.
The systematic errors are less than about 1.0 mas(/yr).
It is available HERE.
- but TRC and Tycho-1 are replaced completely by Tycho-2.