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Review of CCD parallax measurements

Published online by Cambridge University Press:  25 May 2016

C.C. Dahn
C.C. Dahn*
Affiliation:
U.S. Naval Observatory, Flagstaff, AZ USA

Abstract

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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.

Type
Stellar Distances
Information
Symposium - International Astronomical Union , Volume 189: Fundamental Stellar Properties: The Interaction Between Observation and Theory , 1997 , pp. 19 - 24
Copyright
Copyright © Kluwer 1997 

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