Astrometric solar-system anomalies

@article{Anderson2009AstrometricSA,
  title={Astrometric solar-system anomalies},
  author={John David Anderson and Michael Martin Nieto},
  journal={Proceedings of the International Astronomical Union},
  year={2009},
  volume={5},
  pages={189 - 197}
}
  • J. Anderson, M. Nieto
  • Published 1 April 2009
  • Physics, Geology
  • Proceedings of the International Astronomical Union
Abstract There are at least four unexplained anomalies connected with astrometric data. Perhaps the most disturbing is the fact that when a spacecraft on a flyby trajectory approaches the Earth within 2000 km or less, it often experiences a change in total orbital energy per unit mass. Next, a secular change in the astronomical unit AU is definitely a concern. It is reportedly increasing by about 15 cm yr−1. The other two anomalies are perhaps less disturbing because of known sources of… 
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