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When ERS-2 was launched, ERS-1 shared the same orbital plane. This allowed a tandem mission, with ERS-2 passing the same point on the ground 1 day later than ERS-1. ERS-2 has a repeat cycle of 35 days. [4] ERS-2 operated without gyroscopes from February 2001, resulting in some degradation of the data provided by the instruments.