GRACE (Gravity Recovery and Climate Experiment) mission is a joint project between the National Aeronautics and Space Administration (NASA) and Deutsches Zentrum für Luft- und Raumfahrt (DLR). The twin satellites were built by Astrium and launched together with a Rockot in 2002, the mission is operated by the German Satellite Operations Centre and after ten years the mission is still producing outstanding results.
The primary science objective of GRACE is to measure the Earth's gravity field and it's time variability with unprecedented accuracy. The secondary science objective is to obtain approximately 150 very precise globally distributed vertical temperature and humidity profiles of the atmosphere per day using the GPS radio occultation technique.
15 February 2017
The GRACE-A and B Microwave Assemblies (MWA) were switched-off on 5 February 2017, at 00:01 UTC, and 3 February 2017, at 22:00 UTC, respectively. The GRACE-B Accelerometer Instrument Control Unit (ICU) remains off.
21 October 2016
The GRACE-A and -B Microwave Assemblies (MWA) and the GRACE-A Accelerometer Instrument Control Unit (ICU) have been switched-on again.
Mission Facts and Figures