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SSTL-S1 is an 1 metre high resolution earth observation satellite with high speed downlink and 45 degrees off-pointing which is built and owned by Surrey Satellite Technology Ltd (SSTL).

SSTL-S1 is identical to the three DMC 3 (Triplesat) satellites and is also built on SSTL's SSTL-300S1 platform. It has a mass of 450kg and is capable of acquiring multiple targets in one pass, utilising spot, strip and mosaic imaging modes and 45 degree off-pointing agility for a range of applications including urban planning, agricultural monitoring, land classification, natural resource management and disaster monitoring. The very high resolution imager on board the spacecraft has been designed by SSTL and will provide sub-one metre resolution images in panchromatic mode and sub-four metre resolution images in multispectral mode, with a swath width of about 24km.

As the manufacturer and owner of the SSTL-S1 satellite, SSTL will lease imaging payload capacity to 21AT for the lifetime of the satellite, designed to be in excess of 7 years. The SSTL-S1 satellite will contribute sub-one metre resolution image data into 21ATís existing TripleSat Constellation service, comprising three SSTL DMC3 satellites launched in 2015. The addition of the SSTL-S1 satellite will enhance both the revisit capability of the TripleSat Constellation and its efficient global high resolution remote sensing satellite data acquisition and operation services that support a wide range of existing successful user applications by 21ATís domestic and overseas customers.

Nation: U.K.
Type / Application: Earth Observation
Operator: SSTL
Contractors: SSTL
Equipment: 1-meter panchromatic imager, 4-meter imager in 3 spectral bands
Configuration: SSTL-300-S1
Power: Solar cells, batteries
Lifetime: 7 years
Mass: 447 kg
Satellite COSPAR Date LS Launch Vehicle Remarks
SSTL-S1 - 2018 Sr PSLV with ?