| ST-1 | |
| Mission Type: | Communications |
| Operator: | Singapore Telecom Chunghwa Telecom |
| Cospar Id: | 1998-049A |
| Satcat: | 25460 |
| Mission Duration: | 13 years |
| Spacecraft Bus: | Eurostar-2000+ |
| Manufacturer: | Matra Marconi |
| Launch Mass: | 3200kg (7,100lb) |
| Launch Date: | UTC[1] |
| Launch Rocket: | Ariane 44P V109 |
| Launch Site: | Kourou ELA-2 |
| Launch Contractor: | Arianespace |
| Orbit Epoch: | 29 October 2013, 18:16:49 UTC[2] |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Geostationary |
| Orbit Periapsis: | 35771km (22,227miles) |
| Orbit Apoapsis: | 35813km (22,253miles) |
| Orbit Inclination: | 1.83 degrees |
| Orbit Period: | 23.93 hours |
| Orbit Longitude: | 88° east |
| Apsis: | gee |
ST-1 is a communications satellite owned by Singapore Telecom and Taiwan's Chunghwa Telecom Company, Ltd. It was placed launched on 25 August 1998, by an Ariane 4 rocket. The two companies jointly operate the spacecraft from control centres located in Seletar, Singapore and Taipei, Taiwan, respectively.
ST-1 carries 16 high-power transponders and 14 medium-power C-band transponders. Weighing over 3,000 kg (6,600 lb.) at launch, ST-1 generates more than 6,500 watts of electrical power. The satellite's broad C-band coverage beam extends from the Middle East to Japan, including all of Southeast Asia.
ST-1 also features two Ku-band spot beams: a "K1" beam that stretches from Taiwan to Singapore and from Indonesia to Malaysia and a "K2" beam centred over the Indian subcontinent. The ST-1 satellite currently delivers telephony, digital DTH broadcasting, VSAT and other business services throughout the region.
Singapore Telecom and Taiwan's Chunghwa Telecom Company are currently operating the replacement satellite ST-2 after ST-1 has reached its mission duration in 2011.