Fixed Point Method to Analyze Differences between Hipparcos and ICRF2
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Otros documentos de la autoría: Martínez Usó, María José; Marco Castillo, Francisco José; López Ortí, José Antonio
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Título
Fixed Point Method to Analyze Differences between Hipparcos and ICRF2Fecha de publicación
2014-10-14Editor
Hindawi Publishing CorporationCita bibliográfica
Abstract and Applied Analysis, volume 2014 (2014)Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.hindawi.com/journals/aaa/2014/917583/Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Descripción
From 1998, the International Astronomical Union (IAU) adopted a new Celestial Reference System: the International Celestial
Reference System(ICRS). The first optical materialization was the Hipparcos catalogue, ... [+]
From 1998, the International Astronomical Union (IAU) adopted a new Celestial Reference System: the International Celestial
Reference System(ICRS). The first optical materialization was the Hipparcos catalogue, defining the Hipparcos Celestial Reference
Frame (HCRF). The compilation of subsequent radio sources catalogues culminated in the current representation of the ICRF,
the ICRF2 catalogue that is not sufficiently dense to cover all astrometrical purposes. Linking Hipparcos and ICRF2 is essential
to uniformize the reference regardless of whether it is visible (HCRF) or not (ICRF). Many working groups provide their own
complementary catalogs, some of whose sources are also in the ICRF2, with different reduction processes for positions. The point is
that they provide information in more than one reference for a small number of objects. Some of these projects have been used by
us to study the Hipparcos-ICRF2 differences: a certain number of couples of catalogs can be interrelated using a set of parameters.
With these couples, we build a closed cycle with the same ending and departure couple. The parameters obtained fromeach couple
affect the next; thus we have an iterative process whose fixed point is the solution that stabilizes it, providing a preliminary link for
Hipparcos-ICRF2. [-]
Publicado en
MARTÍNEZ USÓ, M. J.; MARCO CASTILLO, F. J.; LÓPEZ ORTÍ, J. A. Fixed Point Method to Analyze Differences between Hipparcos and ICRF2. Abstract and Applied Analysis, volume 2014 (2014), p. 1-7Derechos de acceso
http://rightsstatements.org/vocab/CNE/1.0/
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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