SES-7

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SES-7
Start date May 16, 2009, 00:57 UTC
Launcher Proton-M / Bris-M
Launch site Baikonur 200/39
COSPAR-ID : 2009-027A
Takeoff mass 3905 kg
Mass in orbit 3087 kg
Dimensions 4 m × 2.7 m × 3.6 m
Span in orbit 26 m
Manufacturer Boeing Satellite Systems
Satellite bus BSS-601
lifespan 15 years (planned)
Stabilization Three-axis
operator SES World Skies
Playback information
Transponder 13 S-band, 27 Ku-band
Others
Electrical power Beginning: 9900 W
End: 8800 W.
Power storage 30 NiH accumulators
position
First position 107.7 ° East
Actual position 108.2 ° East
List of geostationary satellites

SES-7 (formerly ProtoStar 2 , Galaxy 8iR and Indostar 2 , also Cakrawarta 2 ) is the name of a telecommunications satellite operated by the satellite operator SES World Skies .

Mission and development

The satellite was originally supposed to be called the Galaxy-8iR and was built by Boeing for PanAmSat . This contract was terminated by PanAmSat in 2002 after a disagreement between the two companies.

On January 14, 2008, Boeing Satellite Systems announced that it would build the ProtoStar 2 satellite for ProtoStar . It was the almost completed Galaxy 8iR, which was modified for ProtoStar.

Technical specifications

ProtoStar 2 is based on the 601HP satellite bus from Boeing and delivered almost 10 kW of electrical power at the start of its 15-year service life. Its take-off mass was 3900 kg, the mass in orbit 3087 kg. The satellite carries 13 S-band transponders (10 in operation, 3 in reserve) and 27 Ku-band transponders (22 in operation, 5 in reserve). The energy is supplied by two solar panels with a span of 26 m and 30 NiH batteries. The satellite itself is about 4 m high and 2.7 × 3.6 m wide. An antenna with a diameter of 272 cm and one with a diameter of 127 cm are available for the Ku band. The transmitting antenna for the S-band also has a diameter of 272 cm, there is also a receiving antenna for the X-band with a diameter of 127 cm.

The control center was created by Integral Systems . The main station was installed in Indonesia and served by Indovision, the replacement station was installed in Singapore, where the ground station for ProtoStar 1 was also located, and served by SingTel. Both stations were equipped with a 13 m antenna.

Operation for ProtoStar

ProtoStar 2 was launched into geotransfer orbit on May 16, 2009 by a Proton launcher . The satellite self-propelled itself to a geostationary position over India at 107.7 degrees east and from there served Indonesia, India, the Philippines and Taiwan with satellite television. The S-band transponders were rented to the Indonesian company Indovision . For this reason, the satellite was also called Indostar 2 or Cakrawarta 2 . After the usual tests, Boeing handed the satellite over to the operator ProtoStar on June 16, 2009.

Auction and operation for SES

Since ProtoStar 2 was not yet able to generate sales and ProtoStar 1 had no broadcasting license since April 2009, the ProtoStar company did not have enough income and got into financial difficulties. It filed for bankruptcy on June 29, 2009. The two functioning satellites ProtoStar 1 and ProtoStar 2 were auctioned as part of the bankruptcy estate.

As before, Indovision had usage rights to the S-band transponders from ProtoStar 2, so that prospective buyers had to take this into account when repositioning. A shift from 107.7 ° East to the SES position 108.2 ° East would still be possible, while a shift to the AsiaSat position 105.5 ° East would have made S-band coverage from Indonesia under the previous conditions impossible .

In the auction on December 16, 2009, SES secured the ProtoStar 2 satellite for $ 185 million. SES outbid AsiaSat, the only competitor. Intelsat had shown interest, but did not take an active part in the auction.

The formalities dragged on until May 2010, after which ProtoStar 2 was renamed SES-7 and positioned at 108.2 ° East to support the NSS-11 satellite in the SES World Skies network .

Web links

Individual evidence

  1. ↑ Gunter Krebs: Galaxy 8i, 8iR. In: Gunter's Space Page. March 8, 2012, accessed October 21, 2012 .
  2. ↑ PanAmSat Cancels Galaxy 8iR Contract. Space And Tech, November 14, 2002; archived from the original on February 14, 2012 ; accessed on October 21, 2012 (English).
  3. ^ Boeing Awarded Contract for Direct-to-Home Entertainment Satellite. Boeing January 14, 2008, archived from the original on May 24, 2011 ; accessed on October 19, 2012 (English).
  4. ↑ Gunter Krebs: Indostar 2 / ProtoStar 2 → SES 7. In: Gunter's Space Page. March 8, 2012, accessed October 24, 2012 .
  5. ↑ Indostar II / ProtoStar II factsheet. (PDF; 145 kB) Boeing, May 2008, archived from the original on June 17, 2012 ; accessed on October 21, 2012 (English).
  6. ↑ Integral Awarded Contract to Provide ProtoStar-II Ground Segment. PRNewswire, April 22, 2008, archived from the original on January 9, 2017 ; accessed on October 19, 2012 (English).
  7. ↑ Stephen Clark: Proton rocket launches TV broadcaster for Asia. Spaceflight Now, May 16, 2009, accessed May 17, 2009 .
  8. ↑ Boeing Hands Over IndoStar II / ProtoStar II Satellite Following Successful In-Orbit Tests. ProtoStar, June 19, 2009, accessed October 25, 2012 .
  9. ↑ Peter B. de Selding: SES Beats Out Rival AsiaSat in Auction for Protostar 2 satellite. Space News, December 17, 2009, accessed October 19, 2012 .
  10. ↑ ProtoStar II Acquisition Closed. SES, May 5, 2010, accessed October 24, 2012 .