Sentinel-3B satellite.
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Sentinel-3B is to be launched tomorrow 25 April 2018.
Is a multi-instrument satellite dedicated to measure sea and land-surface temperature
with high-end accuracy and reliability.
Will support (mainly) ocean forecasting.

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.... if you want to see the launch live:
http://www.esa.int/esatv/Transmissions/2018/04/Sentinel_3B_Launch_live
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