TopSat
| The TopSat being made | |
| Mission type | Optical imaging | 
|---|---|
| COSPAR ID | 2005-043B | 
| SATCAT no. | 28891 | 
| Spacecraft properties | |
| Manufacturer | SSTL | 
| Start of mission | |
| Launch date | 27 October 2005, 06:52:26 UTC | 
| Rocket | Kosmos-3M | 
| Launch site | Plesetsk 132/1 | 
| Orbital parameters | |
| Reference system | Geocentric | 
| Regime | Sun-synchronous | 
| Perigee altitude | 682 kilometres (424 mi) | 
| Apogee altitude | 707 kilometres (439 mi) | 
| Inclination | 98.18 degrees | 
| Period | 98.65 minutes | 
| Epoch | 3 November 2005 | 
TopSat (Tactical Operational Satellite, also known as TopSat 1 and TacSat 0) is a British Earth observation satellite, currently in Low Earth Orbit. The nanosatellite was launched in October 2005 alongside the Beijing-1 Disaster Monitoring Constellation satellite by a Cosmos rocket from Plesetsk Cosmodrome in Russia.