An Improved Empirical Harmonic Model of the Celestial Intermediate Pole Offsets from a Global VLBI Solution

Por favor, use este identificador para citar o enlazar este ítem:
Información del item - Informació de l'item - Item information
Título: An Improved Empirical Harmonic Model of the Celestial Intermediate Pole Offsets from a Global VLBI Solution
Autor/es: Belda, Santiago | Heinkelmann, Robert | Ferrandiz, Jose M. | Karbon, Maria | Nilsson, Tobias | Schuh, Harald
Grupo/s de investigación o GITE: Geodesia Espacial y Dinámica Espacial
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Matemática Aplicada
Palabras clave: Astrometry | Catalogs | Reference systems | Techniques: interferometric
Área/s de conocimiento: Matemática Aplicada
Fecha de publicación: 28-sep-2017
Editor: IOP Publishing
Cita bibliográfica: The Astronomical Journal. 2017, 154(4): 166(14pp). doi:10.3847/1538-3881/aa8869
Resumen: Very Long Baseline Interferometry (VLBI) is the only space geodetic technique capable of measuring all the Earth orientation parameters (EOP) accurately and simultaneously. Modeling the Earth's rotational motion in space within the stringent consistency goals of the Global Geodetic Observing System (GGOS) makes VLBI observations essential for constraining the rotation theories. However, the inaccuracy of early VLBI data and the outdated products could cause non-compliance with these goals. In this paper, we perform a global VLBI analysis of sessions with different processing settings to determine a new set of empirical corrections to the precession offsets and rates, and to the amplitudes of a wide set of terms included in the IAU 2006/2000A precession-nutation theory. We discuss the results in terms of consistency, systematic errors, and physics of the Earth. We find that the largest improvements w.r.t. the values from IAU 2006/2000A precession-nutation theory are associated with the longest periods (e.g., 18.6-yr nutation). A statistical analysis of the residuals shows that the provided corrections attain an error reduction at the level of 15 μas. Additionally, including a Free Core Nutation (FCN) model into a priori Celestial Pole Offsets (CPOs) provides the lowest Weighted Root Mean Square (WRMS) of residuals. We show that the CPO estimates are quite insensitive to TRF choice, but slightly sensitive to the a priori EOP and the inclusion of different VLBI sessions. Finally, the remaining residuals reveal two apparent retrograde signals with periods of nearly 2069 and 1034 days.
Patrocinador/es: This work was funded and realized in the framework of the project AYA2016-79775-P (AEI/FEDER, UE) and APOSTD/2026/079.
ISSN: 0004-6256 (Print) | 1538-3881 (Online)
DOI: 10.3847/1538-3881/aa8869
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2017. The American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Revisión científica: si
Versión del editor:
Aparece en las colecciones:INV - GEDE - Artículos de Revistas

Archivos en este ítem:
Archivos en este ítem:
Archivo Descripción TamañoFormato 
Thumbnail2017_Belda_etal_AstroJ.pdf4,29 MBAdobe PDFAbrir Vista previa

Este ítem está licenciado bajo Licencia Creative Commons Creative Commons