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SSTL-100 bus

Compiled from public sources on 2026-06-26. Not independently verified by Surrey Satellite Technology Ltd.

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Missions → BILSAT-1 (ended) , NigeriaSat-X (extended) , NigeriaSat-1 (ended) , TopSat (ended) , UK-DMC (ended) , UK-DMC 2 (ended)

SSTL microsatellite platform used by AlSat-1 and AlSat-1B for medium-resolution optical Earth observation missions.

SSTL-100 is a Surrey Satellite Technology microsatellite platform family represented by AlSat-1 and AlSat-1B. AlSat-1B is based on the SSTL-100 platform, while ALSAT-1 provides DMC heritage as an enhanced microsatellite designed and constructed by SSTL with CNTS.^[1]^[2] AlSat-1 mass is 90.3 kg and AlSat-1B mass is 100 kg, placing the family in the mini orbital class at the top observed value.^[1]^[2] Payload fit varied by instance: AlSat-1 carried 32 m multispectral imaging over a 600 km swath, and AlSat-1B hosted 24 m multispectral and 12 m panchromatic imagers.^[1]^[2]

Where this fits, supply chain

Compositional position

BILSAT-1 ——— this bus

NigeriaSat-X ——— this bus

NigeriaSat-1 ——— this bus

TopSat ——— this bus

UK-DMC ——— this bus

UK-DMC 2 ——— this bus

Sources

[1]ALSAT-1: Launched 2002, SSTL space portfoliooperator datasheet2026-06-26
[2]AlSat-1B: Launched 2016, SSTL space portfoliooperator datasheet2026-06-26

Cite https://eo-atlas.org/products/bus/sstl-100 Markdown twin → Field definitions →