(Credits ESA)

The ERS-1 satellite’s main mission was to observe Earth, in particular its atmosphere and ocean. Built by ESA, it carried several instruments, including a radar altimeter.

ERS-1 was launched in July 1991, switched off in June 1996 and retired in March 2000. ERS-2, the follow-on from ERS-1, was launched in April 1995. It was used in tandem with ERS-1 from August 1995 to June 1996, their identical orbits (35 days) having a one-day shift.

ERS-1 flew on three different orbits:

  • a 3-day period for calibration and sea ice observation,
  • a 35-day period for multi-disciplinary ocean observations,
  • a 168-day period for geodetic applications.
Satellite ERS-1
Launched 17 July 1991
Mission: Observe Earth and its environment
Altitude: 785 km
Inclination: 98.52°

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