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} }
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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