TopSat is a low cost, high capability micro-satellite designed and built by a QinetiQ-led consortium of British companies. After some initial launch delays, it was successfully launched on October 27, 2005 from the Plesetsk launch site in Northern Russia, along with micro-satellites from China, Iran, and Russia. The launch was the culmination of a project that began in 2000 and was jointly funded by the British National Space Centre (BNSC) and the UK Ministry of Defence.
TopSat is attracting increasing interest from international government and commercial interests because it’s designed to provide 2.5 meter resolution imagery at about 20% of the cost of larger satellites with similar capabilities. It is part of Britain’s larger Micro Satellite Applications in Collaboration (MOSAIC) program.