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To determining the mass of a gravitational body with micro-arcsecond astrometric data

Published online by Cambridge University Press:  01 October 2007

H. Cheng ,
Z. H. Tang  and
C. Huang
H. Cheng
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Science, Nandan Road 200030, Shanghai, China email: chz@shao.ac.cnzhtang@shao.ac.cn
Z. H. Tang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Science, Nandan Road 200030, Shanghai, China email: chz@shao.ac.cnzhtang@shao.ac.cn
C. Huang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Science, Nandan Road 200030, Shanghai, China email: chz@shao.ac.cnzhtang@shao.ac.cn
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Abstract

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A beam of light from a background source to an observer is deflected by a gravitational body when travelling through the space in its vicinity. The deflection changes with configuration of the background source, the gravitational body and the observer, and the amount of deflection is dependent on the gravitational body's mass. It is anticipated that its mass could be determined if the shift can be measured by future precise astrometric projects such as Gaia or SIM-PlanetQuest.

Keywords

stars: fundamental parameters (masses)stars: kinematicsgravitation
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. 264 - 265
Copyright
Copyright © International Astronomical Union 2008

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