version 2
Source: IERS Bulletin A (   0_   0_ )

Orbits: to be used with the IGS Rapid Service Orbits (IGR)

  MJD      Xpole   Ypole  UT1-UTC    LOD  Xsig  Ysig   UTsig  LODsig  Nr Nf Nt
             (10**-6")       (0.1 usec)    (10**-6")    (0.1 usec)  
51664.50   88841  337489  2454016  13240    10    24     188       0   0  0  0
51665.50   89734  336854  2440302  14188  2105  2112    1596       0   0  0  0
51666.50   90553  336172  2426149  14118  4650  4650    4024       0   0  0  0