NSSDCA ID: SIRIO-2
The SIRIO-2 geostationary spacecraft carries two independent payloads: (1) an S-band multichannel transponder for meteorological data dissemination ('MDD') in Africa, and (2) an laser detection/time-tag/retroreflector assembly to permit atomic clock synchronization over intercontinental distances (laser synchronization from stationary orbit - 'LASSO'). The cylindrically shaped spacecraft measures 144 cm in diameter and 240 cm in length including the apogee boost motor. The primary structural members are equipment platforms and a central thrust cone carrying conventional housekeeping electronics in addition to payloads. Attitude, orbit and spin rate control are performed using a hydrazine propulsion system including four thrusters. The spin rate will be maintained at 90 rpm throughout the two-year nominal lifetime. A mechanically despun antenna relays S-band telemetry (meteorological and housekeeping), while a traditional omnidirectional turnstile system supports VHF ranging and telecommands, as well as housekeeping telemetry in transfer orbit and as backup geostationary orbit.
SIRIO-2 was lost in a Ariane launch failure in 1982.
Launch Date: 1982-02-20
Launch Vehicle: Ariane
Launch Site: Kourou, French Guiana
Mass: 420 kg
Questions and comments about this spacecraft can be directed to: Dr. H. Kent Hills
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. P. Berlin | Program Manager | European Space Agency - Toulouse |