Astra 2D
| Operator | SES |
|---|---|
| Major contractors | Hughes |
| Bus | HS-376 |
| Launch date | 19 December 2000 |
| Carrier rocket | Ariane 5 s/n V138 |
| Mission duration | 12 years[1] |
| Mass | 1420 kg (launch) 824 kg (operational) |
| Power | 1,600 watts |
| Orbital elements | |
| Regime | Geostationary |
| Longitude | 24°E (testing) 28.2°E (current) |
| Transponders | |
| Capacity | 16 Ku band |
| Twta output | 39 watts |
| Bandwidth | 16 x 26 MHz |
| EIRP | 53 |
Astra 2D is one of the Astra communications satellites owned and operated by SES, and located at 28.2° east in the Clarke Belt. It is a Hughes HS-376 craft, and was launched from the Guiana Space Centre in December 2000 to join Astra 2A and Astra 2B at 28.2°E, where it has remained for its active life.
As of February 2013, Astra 2D carries no regularly active transponders[2] and is operating in an inclined orbit.[3]
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[edit] In Service
While active, most of Astra 2D's transponders were used to provide television channels available on the Sky Digital satellite service to the United Kingdom and Republic of Ireland and the non-subscription service, Freesat. Provision of rights-sensitive broadcasts Free to air was made possible by the satellite's beam that was tightly focused on the United Kingdom and Ireland. However, surrounding countries had the ability to pick up the signal (dependent on suitably sized satellite dishes) and so could still access Freesat from outside the UK. Some channels on 2D are encrypted with Videoguard (a proprietary encryption method by the NDS Group) and only Sky Digiboxes with valid cards, or standard hardware with non-approved (with respect to the Sky/NDS end-user contract) "Dragon", or "T-Rex" Conditional Access Modules can decode these channels.
The BBC broadcast all of its domestic television channels (including BBC HD and the regional variations) from the Astra 2D satellite, except the BBC News Channel and BBC Parliament which broadcast from Astra 2A. All domestic BBC channels have been free to air since 29 July 2003.
ITV also broadcast all its television channels (including regional variations of ITV1, and STV and UTV) from the Astra 2D satellite. All ITV channels have been free to air from 1 November 2005, although some regions reverted to Free-To-View encryption in 2008 when their lease on one 2D transponder could not be renewed.
Channel 4 broadcast most of its channels free to air from this satellite, including Channel 4, Channel 4+1, E4, More4 and Film4 along with their timeshift variants. All were unencrypted apart from the feeds of Channel 4, Channel 4+1, E4 and E4+1 intended for viewers in Ireland, which remain encrypted.
From November 2008, Five began to transmit free to air for the first time on Astra 2D, using borrowed space on a BBC transponders, allowing the channel to join Freesat.
[edit] End of Service
With a projected lifetime of 12 years, Astra 2D was expected to leave regular operational service towards the end of 2012 or the beginning of 2013 and so the Astra 1N satellite, designed for operation at Astra 19.2°E and launched in August 2011, was initially positioned at 28.2°E to temporarily replace Astra 2D until the start of service of its long-term replacement, Astra 2F, which was launched in September 2012.[4]
Astra 1N started commercial service at 28.2°E in October 2011[5] with transponder testing in October and November. Channels on Astra 2D started to transfer to Astra 1N in December with Channel 5 (plus 5* and 5USA), the Channel 4 family and ITV channels all moving to the new satellite over the next two months. On February 24, 2012 the last remaining channels on Astra 2D (the BBC channels) switched off and started transmission from Astra 1N.[6]
As of April 2013, Astra 2D remains in position at 28.2°E, but with no transponder activity.[7]
[edit] See also
- Astra 2A co-located satellite
- Astra 2B co-located satellite
- Astra 1N co-located satellite
- Astra 28.2°E orbital position
[edit] References
- ^ http://www.ses.com/4233325/news/1999/4426264
- ^ Astra 2D at 28.2°E on lyngsat.com Accessed February 15, 2013
- ^ Astra 2D at 28.2°E on lyngsat.com SatTracker Accessed November 26, 2012
- ^ "Ariane 5 launches Astra 2F" (Press release). Astrium. September 30, 2012.
- ^ "New SES Satellite ASTRA 1N Operational" (Press release). SES. October 24, 2011.
- ^ [1]
- ^ Astra 2D in lyngsat.com SatTracker Accessed April 28, 2013
[edit] External links
- OnAstra - Official consumers/viewers' site
- Astra 2D Ku-band UK/Ireland Beam footprint(s) at SatBeams
- SES guide to receiving Astra satellites
- SES guide to channels broadcasting on Astra satellites
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