Abstract
For users of the Gaia astrometric catalogue it will be essential to have access to the covariance between any pair of astrometric parameters when computing quantities that combine multiple catalogue parameters. The computation and storage of the full covariance matrix for the expected 5 ×109 astrometric parameters (∼108 TeraByte) is, however, expected to be infeasible considering near-future storage and floating-point capabilities. In this paper we describe (without going into the mathematical details) how the covariance of arbitrary functions of the astrometric parameters can be estimated in a computationally efficient way from a reduced amount of data (∼ 2 TeraByte). We also include two examples, explaining how to practically compute the covariance for the average parallax of a star cluster and the acceleration of the solar system barycentre in a cosmological frame.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Holl B, Lindegren L, Hobbs D (2011) A&A (in preparation )
Holl B, Lindegren L, Hobbs D (2011) A&A (in preparation)
Bombrun A, Lindegren L, Holl B, Jordan S (2010) A&A 516:A77 + . DOI 10.1051/0004-6361/200913503
van Leeuwen F (2007) Hipparcos, the New Reduction of the Raw Data. Astrophys Space Sci Libr 350
Górski KM, Hivon E, Banday AJ, Wandelt BD, Hansen FK, Reinecke M, Bartelmann M (2005) ApJ 622:759. DOI 10.1086/427976
Holl B, Hobbs D, Lindegren L (2010) In: Klioner SA, Seidelmann PK, Soffel MH (eds) IAU Symposium, vol 261, pp 320–324. DOI 10.1017/S1743921309990573
Acknowledgements
This work was supported by the European Marie-Curie research training network ELSA (MRTN-CT-2006-033481). LL and DH acknowledge support by the Swedish National Space Board.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 Springer Science+Business Media New York
About this chapter
Cite this chapter
Holl, B., Lindegren, L., Hobbs, D. (2012). Efficient Calculation of Covariances for Astrometric Data in the Gaia Catalogue. In: Sarro, L., Eyer, L., O'Mullane, W., De Ridder, J. (eds) Astrostatistics and Data Mining. Springer Series in Astrostatistics, vol 2. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3323-1_13
Download citation
DOI: https://doi.org/10.1007/978-1-4614-3323-1_13
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-3322-4
Online ISBN: 978-1-4614-3323-1
eBook Packages: Mathematics and StatisticsMathematics and Statistics (R0)