THE TRIGONOMETRIC PARALLAX OF CYGNUS X-1

@article{Reid2011THETP,
  title={THE TRIGONOMETRIC PARALLAX OF CYGNUS X-1},
  author={Mark J. Reid and Jeffrey E. McClintock and Ramesh Narayan and Lijun Gou and Ronald A. Remillard and Jerome A. Orosz},
  journal={The Astrophysical Journal},
  year={2011},
  volume={742},
  pages={83}
}
We report a direct and accurate measurement of the distance to the X-ray binary Cygnus X-1, which contains the first black hole to be discovered. The distance of 1.86{sup +0.12}{sub -0.11} kpc was obtained from a trigonometric parallax measurement using the Very Long Baseline Array. The position measurements are also sensitive to the 5.6 day binary orbit and we determine the orbit to be clockwise on the sky. We also measured the proper motion of Cygnus X-1 which, when coupled to the distance… 

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