Not as precise as Hipparcos catalogue but with many more stars.

* Astrographic Catalog / Tycho, a star catalogue ; see Hipparcos Catalogue

The Hipparcos Catalogue, a high-precision catalogue of more than 100, 000 stars, was published in 1997.

This allows surveys at different wavelengths to be directly correlated with the Hipparcos stars, and ensures that the catalogue proper motions are, as far as possible, kinematically non-rotating.

A variety of methods to establish this reference frame link before catalogue publication were included and appropriately weighted: interferometric observations of radio stars by VLBI networks, MERLIN and VLA ; observations of quasars relative to Hipparcos stars using CCDs, photographic plates, and the Hubble Space Telescope ; photographic programmes to determine stellar proper motions with respect to extragalactic objects ( Bonn, Kiev, Lick, Potsdam, Yale / San Juan ); and comparison of Earth rotation parameters obtained by VLBI and by ground-based optical observations of Hipparcos stars.

The Hipparcos and Tycho Catalogues were then constructed such that the Hipparcos reference frame coincides, to within observational uncertainties, with the International Celestial Reference System ( the ICRS ), and representing the best estimates at the time of the catalogue completion ( in 1996 ).

* Display a realistic night sky, including stars from the USNO A2 catalogue, the Hipparcos Catalogue, the Tycho-2 Catalogue, and the Tully catalogue of galaxies ;

However, Struve's initial result was actually surprisingly close to the currently accepted value of 0. 129 ″, as determined by the Hipparcos astrometry satellite.

Later work consistently argued that the Hipparcos distance measurement for the Pleiades was erroneous.

In 1989, the satellite Hipparcos was launched primarily for obtaining parallaxes and proper motions of nearby stars, increasing the reach of the method tenfold.

Hipparcos ( an acronym for " High precision parallax collecting satellite ") was a scientific mission of the European Space Agency ( ESA ), launched in 1989 and operated between 1989 and 1993.

The name of the space telescope Hipparcos was an acronym for High Precision Parallax Collecting Satellite, and also reflected the name of the Greek astronomer Hipparchus.

The Hipparcos satellite was financed and managed under the overall authority of the European Space Agency.

The Hipparcos satellite was launched ( with the direct broadcast satellite TV-SAT2 as co-passenger ) on an Ariane 4 launch vehicle, flight V33, from Kourou, French Guiana, on 8 August 1989.

This pre-defined star list formed the Hipparcos Input Catalogue: each star in the final Hipparcos Catalogue was contained in the Input Catalogue.

At the accuracy levels of Hipparcos it is of ( marginal ) importance only for the nearest stars with the largest radial velocities and proper motions, but was accounted for in the 21 cases for which the accumulated positional effect over two years exceeds 0. 1 milliarc-sec.

Upsilon Andromedae is located fairly close to the Solar System: the parallax of Upsilon Andromedae A was measured by the Hipparcos astrometry satellite as 74. 12 milliarcseconds, corresponding to a distance of 13. 49 parsecs ( 44 light years ).

The list was based upon the Hipparcos Catalogue ( which has 118, 218 stars ) by filtering on a wide range of star system features.

Initially thought to be around 1500 light years distant, the Alnitak system's distance was determined to be roughly half that via measurement of its stellar parallax by the Hipparcos satellite.

The Tycho Input Catalog was created by the Hipparcos / Tycho international consortia in preparation for the Hipparcos satellite mission.

A Schmidt telescope was at the heart of the Hipparcos satellite from the European Space Agency ( 1989 – 1993 ).

This was used in the Hipparcos Survey which mapped the distances of more than a million stars with unprecedented accuracy-this included 99 % of all stars up to magnitude 11.

In 2000, preliminary Hipparcos astrometrical satellite data indicated that the orbital inclination of the star's companion was 0. 5 °, implying that its mass was as much as 115 times Jupiter's.

The Hipparcos satellite later showed that the star was more distant from earth and therefore brighter resulting in the planet being too hot to be in the habitable zone.

Additional catalogues were compiled for the 23, 882 double / multiple stars and 11, 597 variable stars also analyzed during the Hipparcos mission.

In 1989, the European Space Agency's Hipparcos satellite took astrometry into orbit, where it could be less affected by mechanical forces of the Earth and optical distortions from its atmosphere.

Operated from 1989 to 1993, Hipparcos measured large and small angles on the sky with much greater precision than any previous optical telescopes.

According to the Hipparcos satellite, Arcturus is 36. 7 light years ( 11. 3 parsecs ) from Earth, relatively close in astronomical terms.

According to Hipparcos, Alioth is 81 light years ( 25 parsecs ) from Earth.

Subtitle: " An All-Sky Atlas Comprising One Million Stars to Visual Magnitude Eleven from the Hipparcos and Tycho Catalogues and Ten Thousand Nonstellar Objects ".

This plot shows 22, 000 stars from the Hipparcos Catalogue together with 1, 000 low-luminosity stars ( red and white dwarfs ) from the Gliese Catalogue of Nearby Stars.

Clusters such as the Pleiades, Hyades and a few others within about 500 light years are close enough for this method to be viable, and results from the Hipparcos position-measuring satellite yielded accurate distances for several clusters.

Results prior to the launch of the Hipparcos satellite generally found that the Pleiades were about 135 parsecs away from Earth.

Data from Hipparcos yielded a surprising result, namely a distance of only 118 parsecs by measuring the parallax of stars in the cluster — a technique that should yield the most direct and accurate results.

Based upon parallax measurements made with Hipparcos astrometry satellite, α Arietis is about from Earth.

At an estimated distance of 110 parsecs from Hipparcos, this corresponds to a radius of about 280 million kilometers ( or 170 million miles ), which is roughly 400R < sub >☉</ sub > or 1. 87 AU .< ref name =" NOTERADIUS " group =" note "> To determine the Rasalgheti's radius in terms of solar units, the calculations begin with the formula for angular diameter as follows:

This is a class A star on the main sequence approximately from Earth as measured by the Hipparcos astrometry satellite.

Based upon parallax measurements with the Hipparcos astrometry satellite, Kapteyn's Star is at a distance of from the Earth.

Based upon parallax measurements from the astrometric Hipparcos satellite, the distance to this system is about.

If a binary star has a long orbital period such that non-linear motions of the photocentre were insignificant over the short ( 3-year ) measurement duration, the binary nature of the star would pass unrecognised by Hipparcos, but could show as a Hipparcos proper motion discrepant compared to those established from long temporal baseline proper motion programmes on ground.

Radial velocities for Hipparcos Catalogue stars, to the extant that they are presently known from independent ground-based surveys, can be found from the astronomical data base of the Centre de données astronomiques de Strasbourg.

The distance to this star can be deduced from the parallax measurements made during the Hipparcos, yielding a value of.