Question

How accurately can the distance of a star be measured?

Answer 1

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UR ANS IS...

Because Limitations of Distance Measurement Using Stellar Parallax. Parallax angles of less than 0.01 arcsec are very difficult to measure from Earth because of the effects of the Earth's atmosphere. This limits Earth based telescopes tomeasuring the distances to stars about 1/0.01 or 100 parsecs away.

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Answer 2

https://goo.gl/search/How+accnrately+can+the+distance+of+a+star+be+measured
Parallax and Distance Measurement | Las Cumbres Observatory Parallax angles of less than 0.01 arcsec are very difficult to measure from Earth because of the effects of the Earth's atmosphere. This limits Earth based telescopes to measuring the distances to stars about 1/0.01 or 100 parsecs away.