Sentinel-2
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Model of a Sentinel 2 satellite
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| Manufacturer |
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|---|---|---|---|
| Operator | European Space Agency | ||
| Applications | Land and sea monitoring, natural disasters mapping, sea ice observations, ships detection | ||
| Specifications | |||
| Spacecraft type | Satellite | ||
| Bus | AstroBus-L | ||
| Constellation | 2 | ||
| Design life | 7 years | ||
| Launch mass | 1,140 kg (2,513 lb) | ||
| Dry mass | 1,016 kg (2,240 lb) | ||
| Dimensions | 3.4 × 1.8 × 2.35 m (11.2 × 5.9 × 7.7 ft) | ||
| Power | 1,700 W | ||
| Production | |||
| Status | Active | ||
| Built | 2 | ||
| On order | 2 | ||
| Launched | 1 | ||
| Operational | 1 | ||
| First launch |
Sentinel-2A 23 June 2015 |
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| Last launch |
Sentinel-2B 7 March 2017 |
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Sentinel-2 is an Earth observation mission developed by ESA as part of the Copernicus Programme to perform terrestrial observations in support of services such as forest monitoring, land cover changes detection, and natural disaster management. It consists of two identical satellites, Sentinel-2A and Sentinel-2B.
The Sentinel-2 mission has the following capabilities:
To achieve frequent revisits and high mission availability, two identical Sentinel-2 satellites (Sentinel-2A and Sentinel-2B) are planned to operate simultaneously. The planned orbit is Sun synchronous at 786 km (488 mi) altitude, 14.3 revolutions per day, with a 10:30 a.m. descending node. This local time was selected as a compromise between minimizing cloud cover and ensuring suitable Sun illumination. It is close to the Landsat local time and matches SPOT's, allowing the combination of Sentinel-2 data with historical images to build long-term time series.
The two satellites will work on opposite sides of the orbit. The launch of the first satellite, Sentinel-2A, occurred 23 June 2015 at 01:52 UTC on a Vega launch vehicle. Sentinel-2B was launched on 7 March 2017 at 01:49 UTC, also aboard a Vega rocket.
The Sentinel-2 satellites will each carry a single multi-spectral instrument (MSI) with 13 spectral channels in the visible/near infrared (VNIR) and short wave infrared spectral range (SWIR).
This MSI imager uses a push-broom concept and its design has been driven by the large 290 km (180 mi) swath requirements, together with the high geometrical and spectral performance required of the measurements. It has a 150 mm (6 in) aperture and a three-mirror anastigmat design with a focal length of about 600 mm (24 in); the instantaneous field of view is about 21 degrees by 3.5 degrees. The mirrors are rectangular and made of silicon carbide, a similar technology to those on the Gaia mission.
Sentinel-2 will serve a wide range of applications related to Earth's land surface and coastal zones.
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Wikipedia