The sphere solution and astrometric parameter determination in NDAC

Details The sphere solution and astrometric parameter determination in NDAC The sphere solution and astrometric parameter determination in NDAC

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989hmps....3..171l&link_type=abstract

In its The Hipparcos Mission. Prelaunch Status. Volume 3: The Data Reductions p 171-181 (SEE N90-13548 05-18)

Astronomy and Astrophysics

Astronomy

Astrometry, Data Reduction, Great Circles, Parameter Identification, Reference Stars, Algorithms, Binary Stars, Computer Programs, European Space Programs, Hipparcos Satellite, Image Processing

Scientific paper

The approach for the sphere solution and the astrometric parameter determination of the Hipparcos satellite data reduction adopted by NDAC (Northern Data Analysis Consortium), is presented. Data for the remaining stars, of which many are double, multiple or disturbed by veiling glare, are also studied. An updated version of the input catalog is applied for stellar data derivation. Concerning the observation model, the theoretical abcissa and the global unknowns are examined. Observation and normal equations are studied. The main output stellar data and the organization of the programs are included.

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