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Atomic time scales TAI and TT(BIPM): present performances and prospects

Published online by Cambridge University Press:  21 October 2010

Gérard Petit*
Bureau International des Poids et Mesures 92312 Sèvres Cedex, France email:
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We review the stability and accuracy achieved by the reference atomic time scales TAI and TT(BIPM). We show that they presently are at the level of a few 10−16 in relative value, based on the performance of primary standards, of the ensemble time scale and of the time transfer techniques. We consider how the 1 × 10−16 value could be reached or superseded and which are the present limitations to attain this goal.

Contributed Papers
Copyright © International Astronomical Union 2010


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