Envisat
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| Envisat | |
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| Name | Envisat |
| Mission type | Earth observation |
| Operator | European Space Agency |
| COSPAR ID | 2002-009A |
| SATCAT | 27386 |
| Mission duration | Planned: 5 years, Final: 10 years, 1 month |
| Spacecraft bus | Polar Platform |
| Manufacturer | ESA (prime), Astrium |
| Launch mass | 8,211 kg (18,102 lb) |
| Power | 6.6 kW |
| Launch date | 1 March 2002, 01:07 UTC |
| Launch rocket | Ariane 5G |
| Launch site | Guiana Space Centre, Kourou |
| Disposal type | Decommissioned |
| Deactivated | 9 May 2012 |
| Orbit reference | Geocentric orbit |
| Orbit regime | Sun-synchronous orbit |
| Orbit periapsis | 785 km (488 mi) |
| Orbit apoapsis | 791 km (491 mi) |
| Orbit inclination | 98.55° |
| Orbit period | 100.6 minutes |
| Orbit repeat | 35 days |
| Apsis | gee |
Envisat was a flagship Earth observation satellite operated by the European Space Agency. It was the largest civilian Earth observation spacecraft ever built at the time of its launch, designed to provide comprehensive monitoring of the planet's land, atmosphere, oceans, and ice caps. The mission significantly advanced the study of climate change and environmental processes, continuing the work of earlier missions like ERS-1 and ERS-2.
Overview
As a cornerstone of the European Space Agency's Living Planet Programme, it represented a major leap in observational capability from its predecessors. The satellite operated in a Sun-synchronous orbit, allowing its suite of instruments to observe the entire Earth under consistent lighting conditions. Its primary objectives were to monitor environmental and climatic variables, support disaster management, and contribute to understanding the Earth system. Data from the mission were used by thousands of scientists worldwide and supported international agreements like the Kyoto Protocol.
Development and launch
Development began in the 1990s under the management of the European Space Agency, with major industrial contributions from companies like Astrium. The spacecraft was based on the versatile Polar Platform bus, which was also used for the MetOp series of meteorological satellites. After integration and testing, it was launched on 1 March 2002 aboard an Ariane 5G rocket from the Guiana Space Centre in Kourou, French Guiana. The successful deployment marked a significant achievement for European space industry and scientific collaboration.
Instruments and payload
The payload comprised ten advanced instruments, creating a unique synergistic observing system. Key instruments included the Advanced Synthetic Aperture Radar for all-weather imaging, the Medium Resolution Imaging Spectrometer for ocean color and vegetation, and the Michelson Interferometer for Passive Atmospheric Sounding for atmospheric chemistry. Other notable payloads were the Advanced Along-Track Scanning Radiometer for sea surface temperature, the Global Ozone Monitoring by Occultation of Stars for atmospheric composition, and the Radar Altimeter 2 for precise sea surface height measurements. This combination allowed for simultaneous data collection across multiple environmental parameters.
Mission and scientific contributions
Over its decade-long operational life, it delivered a wealth of data that transformed numerous fields of Earth science. It provided critical long-term records of sea level rise, Antarctic ice sheet dynamics, deforestation in the Amazon rainforest, and global atmospheric pollution levels. The mission tracked major events like the breakup of the Larsen B Ice Shelf, monitored oil spills such as the Deepwater Horizon disaster, and observed seasonal changes in phytoplankton blooms. Its data were essential for validating climate models and formed the basis for thousands of scientific publications.
End of mission and legacy
Contact with the satellite was unexpectedly lost on 8 April 2012, leading to the declaration of the end of the mission on 9 May 2012 by the European Space Agency. The failure was attributed to a power system anomaly. Despite its abrupt end, the mission far exceeded its planned five-year lifespan. Its legacy continues through the vast Envisat data archive, which remains a valuable resource for climate research. The mission also paved the way for subsequent European Space Agency programs, including the Copernicus Programme and its Sentinel satellites, which now provide operational continuity for the observations it pioneered.
Category:European Space Agency satellites Category:Earth observation satellites Category:Spacecraft launched in 2002