Hubble Space Telescope Trigonometric Parallax of Polaris B, Companion of the Nearest Cepheid

@article{Bond2017HubbleST,
  title={Hubble Space Telescope Trigonometric Parallax of Polaris B, Companion of the Nearest Cepheid},
  author={Howard E. Bond and Edmund P. Nelan and Nancy Remage Evans and Gail H. Schaefer and Dianne L. Harmer},
  journal={The Astrophysical Journal},
  year={2017},
  volume={853}
}
Polaris, the nearest and brightest Cepheid, is a potential anchor point for the Leavitt period–luminosity relation. However, its distance is a matter of contention, with recent advocacy for a parallax of ∼10 mas, in contrast with the Hipparcos measurement of 7.54 ± 0.11 mas. We report an independent trigonometric parallax determination, using the Fine Guidance Sensors (FGS) on the Hubble Space Telescope. Polaris itself is too bright for FGS, so we measured its eighth-magnitude companion Polaris… 

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