Astra 2A is one of the Astra communications satellites owned by SES. Launched in 1998 into the 28.2° East orbital position, half its expected end-of-life capacity of 28 transponders were pre-booked by BSkyB, who utilised it to launch their new Sky Digital service.
| Mission type | Communications |
|---|---|
| Operator | SES |
| COSPAR ID | 1998-050A |
| SATCAT no. | 25462 |
| Website | https://www.ses.com/ |
| Mission duration | 15 years (planned) 26 years, 2 months, 22 days (elapsed) |
| Spacecraft properties | |
| Spacecraft type | Boeing 601 |
| Bus | HS-601HP |
| Manufacturer | Hughes Space and Communications |
| Launch mass | 3,635 kg (8,014 lb) |
| Power | 6 kW |
| Start of mission | |
| Launch date | 30 August 1998, 00:31:00 UTC |
| Rocket | Proton-K / DM-03 |
| Launch site | Baikonur, Site 81/23 |
| Contractor | Khrunichev State Research and Production Space Center |
| Entered service | October 1998 |
| Orbital parameters | |
| Reference system | Geocentric orbit[1] |
| Regime | Geostationary orbit |
| Longitude | Astra 28.2°E (1998-2016) 113.5°E (2016-2018) 100°E (2018-2020) Astra 28.2°E (2020-2022) 57.2°E (2022-) |
| Transponders | |
| Band | 32 Ku-band |
| Bandwidth | 33 MHz |
| Coverage area | Europe |
History
editThe satellite suffered pre-launch technical issues with its apogee motors and was moved to a launch by the Proton-K / DM-03 rather than the Ariane 5, as the Proton can inject directly in geostationary orbit (GEO).[2]
When positioned at 28.2 East, it joined DFS Kopernikus-1, which served mainly Eastern Europe. The satellite was the first of Astra's craft to never carry analogue television services (with the exception of a solitary test card in 1999 [3]), and as of 2006, carried standard definition digital television, digital radio, and high-definition digital television, as well as Sky Interactive streams and the AVC Broadband and Silvermead satellite Internet services. Two beams "2A North" and "2A South" transmit on horizontal and vertical polarisation. The South beam covers almost all of Europe, with the North beam covering only Northern Europe at a high power.
In March 2015, two years beyond Astra 2A's projected lifespan, and following the launches of Astra 2E in 2013, Astra 2F in 2012, and Astra 2G in 2014 to 28.2° East, all remaining traffic was transferred from Astra 2A to the newer satellites.[4] From 25 March 2015, Astra 2A remained at 28.2° East, inactive, and was expected to be moved to Astra 23.5°E to operate as a backup satellite to Astra 3B[5] but in the summer of 2016 it was instead moved to 113.5°E.[6] In July 2018, Astra 2A started moving west at approximately 0.6°/day [7] to arrive at its new position of 100° East in August 2018.[8] In May 2020, Astra 2A started moving west at approx 0.8°/day.[9] and in the autumn 2020, it was back at 28.2°E.[10] The satellite was moved to 57.2°E in 2022[11]
See also
edit
References
edit- ^ "ASTRA 2A". N2YO.com. Retrieved 1 June 2020.
- ^ The Satellite Encyclopaedia
- ^ LyngSat (archived)
- ^ Astra 2A frequencies moved to Astra 2E and 2F The Sat And PC Guy 5 March 2015 Accessed 25 March 2015
- ^ Where markets grow via satellite: Our global satellite fleet SES January 2012
- ^ Real Time Satellite Tracking And Predictions Accessed 30 October 2016
- ^ REAL TIME SATELLITE TRACKING AND PREDICTIONS Accessed July 29, 2018
- ^ Real Time Satellite Tracking And Predictions Accessed August 20, 2018
- ^ REAL TIME SATELLITE TRACKING AND PREDICTIONS Accessed May 30, 2020
- ^ REAL TIME SATELLITE TRACKING AND PREDICTIONS Accessed December 31, 2020
- ^ REAL TIME SATELLITE TRACKING AND PREDICTIONS Accessed 23 August 2022