SIRIUS 2 was the largest telecom satellite ever built in Europe at its launch in November 1997.
Its lifetime is expected to be around 15 years. SIRIUS 2 is a 32-transponder satellite, used for direct-to-home transmissions as well as video and data communication services. It transmits both analogue and digital signals. SIRIUS 2 has two DTH beams, each with 13 transponders used for transmission of TV channels to homes equipped with parabolic antennas. One of the beams transmits to the Nordic area and the other towards central and southern Europe.
The Nordic beam has a signal power (EIRP) of 55 dBW in the primary reception area, exceeding 53 dBW for all Nordic and Baltic countries. The receiving antennas need to be no larger than 60 cm (24"). The European beam’s footprint is larger than for the Nordic beam, but the signal power is still high - at least 50 dBW throughout Europe. The receiving antenna size is 60-75 cm (24"-30").
SIRIUS 2 has a third beam, for video and data communications. It consists of six 36 MHz transponders and covers northern and central Europe with a signal power of 46-48 dBW. The uplink band is 14.0-14.25 GHz and the sensitivity is high, more than 9 dB/K in the central coverage area.
The FSS service is flexible because small uplink antennas can be used. The French company Aerospatiale (today Alcatel) built SIRIUS 2 in Cannes. SIRIUS 2 is based on the Spacebus 3000 platform.
SIRIUS 2 Facts
- Orbital position: 4.8° East
- Type: Spacebus 3000, 3 axis stabilized
- Mass in orbit: 1240 kg (2730 lb)
- Dimensions Body: 1.8 x 2.3 x 2.86 m, Span 27.3 m
- Launched: 12 November 1997
- Operational lifetime: 15 years
- Transponders: 26 BSS, 6 FSS
- Frequency band: 11.7-12.5 GHz (BSS), 12.5-12.75 GHz (FSS)
- Transponder bandwidth: 33 MHz (BSS), 36 MHz (FSS)
- Polarization: Linear (horizontal and vertical)