Geostationary Satellite for Defense and Strategic Communications
The Geostationary Satellite for Defense and Strategic Communications (Portuguese: Satélite Geoestacionário de Defesa e Comunicações Estratégicas, or SGDC) is a Brazilian geostationary communication satellite that was built by Thales Alenia Space in France, it was placed in the orbital position of 75 degrees west longitude and will be operated by Telebrás. Telebrás selected Viasat as a partner to help build the associated ground system.[5] The satellite was based on the Spacebus-4000 platform and its life expectancy will be 18 years.[6]
| Mission type | Earth orbiter |
|---|---|
| Operator | Telebrás and Viasat |
| COSPAR ID | 2017-023B[1] |
| SATCAT no. | 42692[2] |
| Website | Portal SGDC Telebras |
| Mission duration | 18 years (planned) |
| Spacecraft properties | |
| Bus | 4000C4 |
| Manufacturer | Thales Alenia Space |
| Launch mass | 5,735 kg (12,644 lb) |
| Dimensions | 7.10 m × 2.20 m × 2.0 m (23.3 ft × 7.2 ft × 6.6 ft) |
| Power | 11 kW |
| Start of mission | |
| Launch date | May 4, 2017, 21:52 UTC[3][4] |
| Rocket | Ariane 5 VA236 |
| Launch site | Kourou ELA-3 |
| Contractor | Arianespace |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Longitude | 73.7° W[2] |
| Semi-major axis | 42,164.0 km (26,199.5 mi)[2] |
| Eccentricity | 0.00016[2] |
| Perigee altitude | 35,784.6 km (22,235.5 mi)[2] |
| Apogee altitude | 35,802.6 km (22,246.7 mi)[2] |
| Inclination | 0.0229°[2] |
| Period | 1,436.1 minutes[2] |
| RAAN | 66.4545°[2] |
| Argument of perigee | 43.2613°[2] |
| Mean anomaly | 250.3095°[2] |
| Mean motion | 1.00272241[2] |
| Epoch | July 8, 2018[2] |
| Revolution no. | 436 |
| Transponders | |
| Band | 50 Ka band 7 IEEE X-band |
| Coverage area | Brazil, South Atlantic Ocean |
The satellite was successfully launched into space on May 4, 2017, at 21:52 UTC, by means of an Ariane 5 vehicle from the French company Arianespace, launched from Guiana Space Centre, Kourou, French Guiana, together with the Koreasat 7.[7] It had a launch mass of 12,800 pounds (5,800 kg). The SGDC will be equipped with 50 Ka band transponders and 5 X band transponders to provide broadband internet and communications to the Brazilian government and the Brazilian Armed Forces.[8]
A backup satellite, SGDC-2, was initially planned for launch no earlier than 2022.[9] As of July 2021, the procurement of this satellite has been delayed indefinitely due to concerns over cost and the legality of the procurement agreement.[10][11]
See also
edit
References
edit- ^ NASA, Goddard Space Flight Center (14 May 2017). "SGDC". NSSDC Master Catalog. Retrieved 14 May 2017.
- ^ a b c d e f g h i j k l m n2yo.com (July 8, 2018). "SGDC". Retrieved July 8, 2018.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^ Clark, Stephen (10 January 2017). "Launch schedule". Spaceflight Now. Retrieved 11 January 2017.
- ^ Gunter, Krebs. "SGDC 1". Retrieved May 4, 2017.
- ^ Viasat. "Telebras, Viasat Enter into Strategic Agreement to Connect the Unconnected in Brazil". Retrieved March 6, 2018.
- ^ Gunter, Kreb's. "SGDC 1". Gunter's Space Page. Retrieved December 7, 2016.
- ^ "Brasil lança satélite que permitirá acesso à banda larga em áreas remotas". G1, Brasília (in Portuguese). May 4, 2017. Retrieved May 4, 2017.
- ^ Satélite geoestacionário vai garantir a segurança das comunicações brasileiras. Archived 2016-12-20 at the Wayback Machine Telebrás (in Portuguese). Retrieved 2016-12-07.
- ^ Henry, Caleb (April 10, 2019). "Brazil to order second dual civil-military communications satellite". SpaceNews. Retrieved September 17, 2019.
- ^ OECD (October 26, 2020). "OECD Telecommunication and Broadcasting Review of Brazil 2020" (PDF). DevelopmentAid: 182. doi:10.1787/30ab8568-en. ISBN 978-92-64-31744-4. S2CID 243034008. Retrieved September 28, 2021.
- ^ "'What we're doing is an auction with an extremely low spectrum price'". BNamericas. July 24, 2021. Retrieved September 28, 2021.
BNamericas: Will there be a new geostationary satellite? It was part of the initial SGDC program plan that Brazil had more than one geostationary satellite. Menezes: Yes, the initial idea was to have a constellation. But I think there's no space for this at the moment. We're not discussing it. But there are private options out there.
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