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IERS Message No. 422                                   February 11, 2021
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Change of nutation offsets in the EOP series 14 C04


Dear colleagues,

The nutation offsets in the EOP 14 C04 series have been reprocessed over
the period 2018-2021.

The precedent version was affected by erroneous values. This problem
resulted from freezing the nutation offsets for all the dates prior to
the last 30 days, whereas the VLBI nutation solutions were given with a
latency of at least 20 days.

In order to avoid this shortcoming, the update of the nutation
corrections will concern the last 60 days from the current date, and
thus the last 30 days of the C04 solution.

Christian Bizouard
IERS Earth Orientation Centre
Observatoire de Paris


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