Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program

@article{Vrba2004PreliminaryPO,
  title={Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program},
  author={Frederick John Vrba and Arne Anthon Henden and Christian B. Luginbuhl and Harry H. Guetter and Jeffrey A. Munn and Blaise Joseph Canzian and A. J. Burgasser and J. Davy Kirkpatrick and X. Fan and T. R. Geballe and David A. Golimowski and Gillian Knapp and Sandy K. Leggett and Donald P. Schneider and John Brinkman},
  journal={The Astronomical Journal},
  year={2004},
  volume={127},
  pages={2948-2968}
}
We present preliminary trigonometric parallaxes and proper motions for 22 L dwarfs and 18 T dwarfs measured using the ASTROCAM infrared imager on the US Naval Observatory (USNO) 1.55 m Strand Astrometric Reflector. The results presented here are based on observations obtained between 2000 September and 2002 November; about half of the objects have an observational time baseline of Δt = 1.3 yr and half Δt = 2.0 yr. Despite these short time baselines, the astrometric quality is sufficient to… 
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