The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Bohr radius
$ a_0 = \alpha/4{\rm\pi} R_\infty = 4{\rm\pi} \epsilon_0 \hbar^2/m_{\rm e} e^2 $
 Value  0.529 177 208 59 x 10-10 m
 Standard uncertainty  0.000 000 000 36 x 10-10 m
  Relative standard uncertainty   6.8 x 10-10
 Concise form  0.529 177 208 59(36) x 10-10 m    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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