The ITRF2008 origin is defined in such a way that there are null translation parameters at epoch 2005.0 and null translation rates between the ITRF2008 and the ILRS SLR time series.

The ITRF2008 scale is defined in such a way that there null scale and scale rate between ITRF2008 and the average of VLBI and SLR scales/rates.

The ITRF2008 orientation is defined in such a way that there are null rotation parameters at epoch 2005.0 and null rotation rates between the ITRF2008 and ITRF2005. These two conditions are applied over a core network (see section transformation parameters between ITRF2008 and ITRF2005)