Sirius (satellite)
Sirius was a constellation of communications satellites operated at 5°E in geostationary orbit (GEO) by NSAB (later SES Sirius, and now a non-autonomous part of SES, owner and operator of the Astra satellites). They carried digital satellite television to the countries of Scandinavia, Baltic states, eastern Europe and Africa, including the Viasat pay TV system, along with several pay TV packages for eastern Europe, the TopTV package for Africa, a number of Ukrainian channels and the national Latvian and Lithuanian channel service free-to-air.
A fourth satellite, Sirius 4, was ordered in 2005 and launched at 22:39:47 on 17 November 2007. It carries 52 active Ku-band transponders and two active Ka-band transponders. Sirius 4 was built by Lockheed Martin Space Systems based upon the A2100AX design.
Among the services carried are Viasat and Viasat Ukraine which has used the Sirius satellites for their digital platform since its launch.
Sirius 4 was renamed to Astra 4A in June 2010, when the SES took full ownership and control of SES Sirius.
Sirius 1 (later Sirius W) was purchased from British Sky Broadcasting after Sky Television's merger with British Satellite Broadcasting (the merger was conducted on Sky's terms and BSB's satellites were sold in favour of Sky's leased Astra satellite operations). The satellite had previously operated as Marcopolo 1. It operated at 5° east from 1994 until 2000, when it was moved to 13° west. It operated here before being dumped to graveyard orbit in 2003.
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