GRACE operational issue: Planned switch-on of Microwave Assemblies
19 January 2015
The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again on:
Additionally on 15 December 2014 an orbit manoeuvre was executed on GRACE-B in order to accelerate the drift towards GRACE-A as initiation of a satellite switch. The satellite swap intends to save fuel on GRACE-B by staying on the better performing GRACE-B star camera for the first half of 2015.
During the manoeuvre the two satellites had a minimum distance of 251 m on 28 December.
A drift stop manoeuvre followed by a 180 degree yaw turn of both satellites on 15 January finished the swap.