  We measured the absolute frequency of the optical clock transition 1S0 (F =
1/2) - 3P0 (F = 1/2) of 171Yb atoms confined in a one-dimensional optical
lattice and it was determined to be 518 295 836 590 863.5(8.1) Hz. The
frequency was measured against Terrestrial Time (TT; the SI second on the
geoid) by using an optical frequency comb of which the frequency was
phase-locked to an H-maser as a flywheel oscillator traceable to TT. The magic
wavelength was also measured as 394 798.48(79) GHz. The results are in good
agreement with two previous measurements of other institutes within the
specified uncertainty of this work.
