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Astrometric detection of faint companions – the Pluto/Charon case study

Published online by Cambridge University Press:  01 October 2007

A. H. Andrei ,
V. Antunes Filho ,
R. Vieira Martins ,
M. Assafin ,
D. N. da Silva Neto  and
J. I. B. Camargo
A. H. Andrei
Affiliation:
Observatório Nacional/MCT R. Gal. Jos Cristino 77, RJ, Brasil email: [email protected] Observatório do Valongo/UFRJ, Brasil
V. Antunes Filho
Affiliation:
Observatório do Valongo/UFRJ, Brasil
R. Vieira Martins
Affiliation:
Observatório Nacional/MCT R. Gal. Jos Cristino 77, RJ, Brasil email: [email protected]
M. Assafin
Affiliation:
Observatório do Valongo/UFRJ, Brasil
D. N. da Silva Neto
Affiliation:
Observatório do Valongo/UFRJ, Brasil Universidade Estadual da Zona Oeste/RJ, Brasil
J. I. B. Camargo
Affiliation:
Observatório do Valongo/UFRJ, Brasil
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Abstract

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The resolution of pairs of objects closer than the scale of seeing, and of difference of magnitude larger than ten percent is unreliable by direct imaging. The resulting image FWHM differs from a true PSF by no more than four percent. Yet, the peak of the associated Gaussian is shifted to a larger proportion.

The main results are the description of the FWHM and peak location shifts as function of the seeing scale, the centers separation, and of the magnitudes difference. Analytically, the estimators of variation were the resulting Gaussian amplitude, mean value, and standard deviation. The later is shown to be the most reliable estimator.

Keywords

methods: data analysistechniques: image processingastrometryplanets and satellites: generalbinaries: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 104 - 105
Copyright
Copyright © International Astronomical Union 2008

References

Sicardy, B., Bellucci, A., Gendron, E. et al. 2006, Nature 439, 52CrossRefGoogle Scholar