Astra 4A

Astra 4A

Broadcast satellite
Name = Astra 4A
Launch Date = Birth date|2007|11|18
Launch Mass = 4,600
Orbit Mass =
Manufacturer = Lockheed Martin
Model = A2100AX
Launcher = Proton
Flight Number =
Lifetime = 15
Transponder Capacity = 6 Ku band
TWTA output power =
Bandwidth = 36
EIRP = 50
Expendable Energy = 8100
Former location =
Current location = 5

Astra 4A is a communications satellite owned and operated by SES Astra, launched in 2007 to the Astra 5°E orbital slot providing digital television and radio broadcasts, data, and interactive services to sub-Saharan Africa.

The satellite is physically part of the Sirius 4 satellite, comprising the FSS Africa beam that provides six 36MHz transponders for sub-Saharan Africa [cite web |url= http://www.ses-sirius.com/satellites/sirius-4/ |title=Sirius 4 Factsheet |publisher= SES SIRIUS | accessmonthday= August 28 |accessyear=2008 ] . The Sirius 4 satellite also carries a dedicated payload of two transponders for Ka-band services, for future applications such as interactive and contribution services.

TV signals are broadcast with signals levels on the ground (EIRP) of up to 50dBW, receivable with a 60cm dish. The minimum signal level across almost all of mainland sub-Saharan Africa is 44dBW, requiring a 120cm dish [cite web |url= http://www.ses-astra.com/business/en/satellite-fleet/satellite-list/astra4a/index.php |title=Astra 4A |publisher= SES ASTRA | accessmonthday= August 28 |accessyear=2008 ] .

Although part of a satellite launched and operated by SES Sirius, the commercial responsibility for Astra 4A rests with SES Astra.

The Astra 4A designation was originally given in June 2005 to 33 transponders of the NSS-10 craft (formerly AMC-12) owned by another subsidiary of SES, SES New Skies, and positioned at 37.5°West for broadcast, data, and telecommunications into Africa. [cite press release |publisher=SES ASTRA|date=February 17, 2006|url= http://www.ses-astra.com/business/en/news-events/press-archive/2006/06-02-17/index.php |title= SES Global Africa completes first successful year in African business ]

References

ee Also

*Astra 1C co-located satellite
*Sirius 3 co-located satellite
*Sirius 4 co-located satellite
*Astra 5°E orbital position
*SES Astra satellite owner

External Links

* [http://www.ses-astra.com/consumer/en/how-to-receive-astra/index.php SES Astra guide to receiving Astra satellites]
* [http://www.ses-astra.com/consumer/en/channel-guide/index.php SES Astra guide to channels broadcasting on Astra satellites]
* [http://www.ses-astra.com SES Astra Website]
* [http://www.satbeams.com/footprints?beam=5679 Astra 4A Africa beam footprint on SatBeams]
* [http://www.ses-sirius.com SES Sirius Website]


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