Hipparcos, the New Reduction of the Raw DataThepublication oftheHipparcos andTycho Catalogues in 1997 transformed astrometry, and as a consequence astronomers’ perception of astrometry. What had before often been regarded as a somewhat quaint specialty of limited re- vance to modern astrophysics, was suddenly seen to produce a wealth of data of immediate practical use. The ready availability of many thousand precise trigonometric stellar distances and the access to an accurate and dense - tical reference frame have changed the way astronomers think about certain problems and plan their experiments. Inevitably, the exploitation of so much new data not only solved some old problems, tidied up several confused areas and sharpened many observational constraints, but it also generated new qu- tions about established theory – and about the data themselves. The author of this book has taken a radical approach to answer some of these questions: a complete re-examination of the satellite data and the models used to represent them, in particular the attitude modelling. Eventually this resulted in the new and very signi?cantly improved Hipparcos reduction described in this book. This remarkable achievement was made possible by a combination of many factors, including time and the exponential growth of computing power, but mainly an incredible amount of detailed, tedious and ingenious work by the author and the resulting insight into what really went on with the satellite in its unhappy orbit. Dr. |
Contents
Introduction to the Hipparcos mission | 2 |
HIPPARCOS ASTROMETRY | 39 |
Exploring the Hipparcos Astrometric Data | 71 |
THE ASTROMETRIC DATA FOR COMPOSITE | 113 |
GROUPS OF SINGLE STARS | 143 |
KINEMATICS OF THE SOLAR | 177 |
A Description of the Contents and Peculiarities | 196 |
Hipparcos Attitude Modelling | 216 |
Summary of Selected Spacecraft | 286 |
PAYLOAD CALIBRATIONS | 299 |
SPACECRAFTPARAMETER CALIBRATIONS | 329 |
The Next Generation | 346 |
Appendices | 369 |
F Reference orbital parameters | 393 |
Bibliography | 419 |
| 439 | |
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Common terms and phrases
abscissa residuals absolute magnitude accuracy along-scan attitude amplitude analysis arcsec astrometric data astrometric parameters attitude modelling attitude reconstruction basic angle binaries centre Cepheids clock drift coefficients Column components coordinates corrections correlations curve defined derived described determined dispersion distance distortions distribution double star drift eclipses effects field of view field transits Figure fitted formal errors function Gaia Gaia mission galactic graph gyro harmonic Hipparcos catalogue Hipparcos data Hipparcos mission HR diagram Hyades instrument parameters interval iterations Leeuwen Lindegren magnetic main sequence matrix measurements modulation NDAC noise observed obtained on-board clock open clusters parallax pass band payload perigee plane Pleiades position proper motions published data radial velocity reduction reference frame relation relative rotation phase satellite scan scan-phase shown in Fig shows signal slits solution spacecraft spin axis spline star mapper stellar Table telescope thruster firings tion torques values variable variations vector