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IERS Message No. 353                                      March 28, 2018
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Anticipated change to the IERS Bulletin A solution


Dear IERS users,

As of Bulletin A Vol XXXI, No. 013, on 29 March, 2018, the IERS Rapid
Service/Prediction Center will transition the EOP solution to be
consistent with the 14 C04 for polar motion, UT1-UTC, and celestial pole
offsets. This change will result in a jump of less than 0.1 mas in polar
motion and 10 us in UT1-UTC. Small adjustments will be made to the
celestial pole offsets from approximately March 2017 to present in order
to be more consistent with the 14 C04 solution. The only users who need
to be concerned with this change are those who need EOP accuracy to be
better than 0.1 mas (~0.3 cm at the Earth's surface, ~1.2 cm at GPS
orbit.)

A final notice of the anticipated change will be contained near the top
of the IERS Bulletin A Vol XXXI, No. 013, on 29 March 2018, where notes
to users are placed. Users are strongly encouraged to review this
message to confirm the change or to note if the change was not
implemented due to technical problems.

Kind regards,
Nick Stamatakos
IERS Rapid Service Prediction Centre:
Production director and lead project scientist


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