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16. A tridimensional model of the galactic interstellar extinction.
Arenou, F.; Gomez, A.; Grenon, M.
The distribution of interstellar extinction has been mapped over the whole sky, using all available spectral and photometric data. The color excess distribution is modelled as a function of galactic latitude, longitude and distance within about 1 kpc from the sun. The model was used to predict the reddened Tycho and Johnson (B-V) colors, with the …
The TYCHO Input Catalogue. Cross- matching the Guide Star Catalog with the HIPPARCOS INCA Data Base.
Turon, C.; Didelon, P.; Egret, D. +2 more
A Tycho Input Catalogue of three million stars brighter than V = 12,1 has been produced for the needs of the Tycho data analysis. This catalog results from the cross-matching of a subset of the Hubble Space Telescope Guide Star Catalog with the Hipparcos INCA Data Base. The cross-matching procedure is explained and statistics about the magnitude d…
The HIPPARCOS Input Catalogue. I - Star selection
Arenou, F.; Crifo, F.; Gomez, A. +7 more
The Hipparcos Input Catalogue has been compiled, over the period 1982-1991, as the definitive observing catalog for the ESA's Hipparcos satellite, launched on 8 August 1989. It contains the most up-to-date, comprehensive, and homogeneous information on the 118,000 stars being observed by Hipparcos. Its stellar and data content is described in a se…
The NDAC HIPPARCOS data analysis consortium - Overview of the reduction methods
Snijders, M. A. J.; Evans, D. W.; Lindegren, L. +7 more
This paper gives an overview of the assumptions and algorithms adopted by the Northern Data Analysis Consortium (NDAC) for the reduction of data from the space astrometry satellite Hipparcos. A fairly detailed account is given of the main steps of the reduction, viz., the attitude determination, analysis of image dissector tube data, great-circle …
In-orbit performance of the HIPPARCOS astrometry satellite
Grewing, M.; Lindegren, L.; Turon, C. +7 more
Launched in August 1989 into a geostationary transfer orbit, the Hipparcos astrometry satellite failed to reach its intended geostationary orbit through the failure of its apogee boost motor. Present indications are that the possible operational lifetime should nevertheless extend beyond the end of 1992, with extremely high-quality scientific data…
The FAST HIPPARCOS Data Reduction Consortium: Overview of the Adopted Reduction Software
Badiali, M.; Cardini, D.; Emanuele, A. +38 more
This paper gives the main features of the data analysis methods adopted by FAST in the calibration and processing of the Hipparcos data. The structure of the data reduction software is described and the actual processing and evaluation is presented.
TYCHO Data Analysis. Overview of the Adopted Reduction Software and First Results
Snijders, M. A. J.; Grewing, M.; Pedersen, H. +15 more
In the Tycho project astrometric and photometric data of about 1,000,000 stars to a limit of B = 12 mag will be derived. The brightest 500,000 stars will obtain magnitudes in two colors BT and VT, the fainter 500,000 usually only one broad-band magnitude T. There is confidence that an accuracy will be achieved about 0.03 arcsec for positions and 0…
Positions and parallaxes from the HIPPARCOS satellite - A first attempt at a global astrometric solution
Lindegren, L.; van Leeuwen, F.; Perryman, M. A. C. +2 more
The last stage of the basic astrometric reduction of Hipparcos data is to combine angular measurements along great-circle scans into a globally coherent system of positions, proper motions and trigonometric parallaxes. We report the results of a first attempt at such a 'sphere solution' of positions and parallaxes using great-circle results calcul…
CPC2 - the Second Cape Photographic Catalog - Part Two - Conventional Plate Adjustment and Catalog Construction
Zacharias, N.; de Vegt, C.; Nicholson, W. +1 more
The Second Cape Photographic Catalog CPC 2, containing positions and visual magnitudes of 276 t 31 stars in the approximate magnitude range V= 6.5-10.5 is the first modern photographic catalog project on the southern hemisphere with an optimal fourfold plate overlap pattern and an astrometrically optimized spectral bandpass in the yellow - red reg…
The HIPPARCOS Input Catalogue. III - Photometry
Grenon, M.; Mermilliod, J. C.; Mermilliod, M.
Photometric information about stars proposed for observation by the astrometric satellite Hipparcos is used for several purposes. Instrumental colors and magnitudes served as an input to the definition of the observing program (e.g. in defining the magnitude-limited survey), in optimizing the observations by allocating observing time according to …