Several groups, using 1-m to 2-m telescopes on ‘visitor’ arrangements, have employed CCDs to measure stellar trigonometric parallaxes with precisions in the range ±2–5 mas. More intensive observing efforts now routinely achieve sub-mas results with the best obtained to date in the ±0.3–0.5 mas range. Selective dimming of bright target stars using neutral density spots now permit CCD parallax measures of stars as bright as R~4.


Flare Star Faint Star Trigonometric Parallax Astronomical Community Target Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • C. C. Dahn
    • 1
  1. 1.U.S. Naval ObservatoryFlagstaffUSA

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