Lotos-S1 (Cosmos 2455) series of Russian radio-technical reconnaissance (RTR) satellites, which are one of the components of the next-generation radio-technical reconnaissance system, ICRC Liana.
| Name of Satellite | Lotos-S1 (Cosmos 2455) |
| Purpose | Earth Observation |
| Contractor | TsSKB-Progress Samara Space Center and KB Arsenal |
| Country of Contractor | Russia |
| Launch Mass (kg.) | 5 000 |
| Class of Orbit | LEO |
| Perigee (km) | 900 |
| Date of Launch | 20.11.2009 |
| Launch Site | Plesetsk Cosmodrome |
| Launch Vehicle | Soyuz U |
| COSPAR Number | 2009-063A |
| NORAD Number | 36095 |
The Lotos-S1 satellite, which is one of the Russian Lotos – S1 satellites, is the first component of the next-generation Liana ELINT satellite system. The engineering version flew under the designation Lotos-S.
