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Astrometry for New Reductions: The ANR method

Published online by Cambridge University Press:  07 March 2018

Vincent Robert Open the ORCID record for Vincent Robert [Opens in a new window]  and
Christophe Le Poncin-Lafitte
Vincent Robert
Affiliation:
IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Lille 1, 77 avenue Denfert-Rochereau, F-75014, Paris, France email: [email protected] IPSA, Institut Polytechnique des Sciences Avancées, 63 bis boulevard de Brandebourg, F-94200, Ivry-sur-Seine, France
Christophe Le Poncin-Lafitte
Affiliation:
SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE, 61 avenue de l'Observatoire, F-75014, Paris, France email: [email protected]
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Abstract

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Accurate positional measurements of planets and satellites are used to improve our knowledge of their orbits and dynamics, and to infer the accuracy of the planet and satellite ephemerides. With the arrival of the Gaia-DR1 reference star catalog and its complete release afterward, the methods for ground-based astrometry become outdated in terms of their formal accuracy compared to the catalog's which is used. Systematic and zonal errors of the reference stars are eliminated, and the astrometric process now dominates in the error budget.

We present a set of algorithms for computing the apparent directions of planets, satellites and stars on any date to micro-arcsecond precision. The expressions are consistent with the ICRS reference system, and define the transformation between theoretical reference data, and ground-based astrometric observables.

Keywords

AstrometryCatalogsMethods: miscellaneous
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 96 - 97
Copyright
Copyright © International Astronomical Union 2018 

References

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Robert, V., Pascu, D., Lainey, V., Arlot, J.-E., De Cuyper, J.-P., Dehant, V., & Thuillot, W., 2016, A&A, 596, A37 Google Scholar