GeoStar

from Wikipedia, the free encyclopedia

The GeoStar is a satellite bus for small and medium-sized communications satellites from the American Orbital Sciences Corporation .

On the basis of this design, Orbital manufactures various payloads for the end customer that are tailored to the respective requirements. It is compatible with various launch systems and can, for example, be launched with the Atlas V , Ariane 5 , Falcon 9 and Proton launch vehicles . The STAR-1 was used for the first time at IndoStar 1 in November 1997 and has been used since then in the improved STAR-2 version. In 2011 the satellite bus was renamed GeoStar . The first satellite to be launched under this name is SES-8 . A total of 3 satellites were launched under the name GeoStar-3 . For a fully electrified version there is the GeoStar-2e, for which 2 more satellites have currently been ordered.

Technical specifications

The basic structure of the three-axis stabilized satellites has a size of 1.75 m × 1.7 m × 1.8 m and consists of aluminum alloys and composite materials . The curb weight is 558 kg each. The energy supply of the satellite and its payload is provided by gallium arsenide - solar cell surfaces that generate up to 5 kW of power (in the later version up to 7.5 kW), two 4.84 kWh lithium-ion batteries and a 24–36 V DC bus system guaranteed. A hydrazine engine is used as the drive in orbit . A MIL-STD-1750A processor with a MIL-STD-1553 B bus system takes over control . For position control are earth and sun sensors and optional star sensors used.

commitment

Launched satellites

designation Bus version Orderer Year of appointment Start date ( UTC ) Launcher NSSCD ID Remarks
IndoStar 1 STAR-1 IndoStar 1993 12.11.1997, 21:48 Ariane-44L 1997-071B
BSAT-2a STAR-1 BSAT 1999 03/08/2001 , 10:51 pm Ariane 5G 2001-011B
BSAT-2b STAR-1 BSAT 1999 07/12/2001, 10:58 pm Ariane 5G 2001-029B False start, orbit too low
N-STAR c STAR-2 Nippon Telegraph and Telephone (NTT) 2000 07/05/2002, 11:22 pm Ariane 5G 2002-035B
Galaxy 12 STAR-2 Galaxy 2001 04/09/2003, 22:52 Ariane 5G 2003-013B
BSAT-2c STAR-1 BSAT 2001 11.06.2003, 22:38 Ariane 5G 2003-028A
Galaxy 14 STAR-2 Galaxy 2001 13/08/2005, 23:28 Soyuz-FG / Fregat 2005-030A
Galaxy 15 STAR-2 Galaxy 2001 13.10.2005, 22:32 Ariane 5GS 2005-041A
Telkom-2 STAR-2 Telkom 2002 16.11.2005, 23:46 Ariane 5 ECA 2005-046A
Optus D1 STAR-2.4 Optus 2003 10/13/2006, 8:57 pm Ariane 5 ECA 2006-043B
Optus D2 STAR-2.4 Optus 2003 05.10.2007, 22:02 Ariane 5GS 2007-044A
Intelsat 11 STAR-2 Intelsat 2005 05.10.2007, 22:02 Ariane 5GS 2007-044B
Horizons 2 STAR-2 Intelsat 2005 12/21/2007, 9:42 pm Ariane 5GS 2007-063B
Thor 5 STAR-2 Telenor 2005 02/11/2008, 11:34 am Proton-M / Bris-M 2008-006A
Measat-3A STAR-2 Measat 2005 June 21, 2009, 9:50 pm Zenit-3 SLB 2009-032A
AMC-21 STAR-2 SES Americom 2006 08/14/2008, 8:44 pm Ariane 5 ECA 2008-038B
NSS-9 STAR-2 SES World Skies 2006 12.02.2009, 22:09 Ariane 5 ECA 2009-008A
Intelsat 16 STAR-2.4 Intelsat 2006 02/12/2010, 12:39 am Proton-M / Bris-M 2010-006A
Optus D3 STAR-2.4 Optus 2007 21.08.2009, 22:09 Ariane 5 ECA 2009-044B
Intelsat 15 STAR-2.4 Intelsat 2007 11/30/2009, 9:00 p.m. Zenit-3 SLB 2009-067A
SES-1 STAR-2.4 SES World Skies 2007 04/24/2010, 11:19 am Proton-M / Bris-M 2010-016A
SES-2 STAR-2.4 SES World Skies 2007 21.09.2011, 21:38 Ariane 5 ECA 2011-049A
Koreasat 6 STAR-2 Korea Telecom 2008 12/29/2010, 9:27 pm Ariane 5 ECA 2010-070B
New Dawn STAR-2.4 Intelsat 2008 04/22/2017, 9:37 pm Ariane 5 ECA 2011-016A C-band reflector antenna did not unfold
SES-3 STAR-2.4E SES World Skies 2008 07/15/2011, 11:16 pm Proton-M / Bris-M 2011-035A
Intelsat 18 STAR-2.4E Intelsat 2008 05.10.2011, 9:00 p.m. Zenit-3 SLB 2011-056A
HYLAS 2 STAR-2.4E Avanti Communications 2009 08/02/2012, 8:54 pm Ariane 5 ECA 2012-043B
Intelsat 23 STAR-2.4E Intelsat 2009 10/14/2012 , 8:37 am Proton-M / Bris-M 2012-057A
OHO-1 STAR-2.3 OverHorizon 2009 2012 (originally) Ariane 5 ECA - Not started
Star One C3 STAR-2.4E Star One 2010 11/10/2012, 9:05 pm Ariane 5 ECA 2012-062A
MEXSAT-3 STAR-2.4E Secretaría de

Comunicaciones y Transportes

2010 19/12/2012, 21:49 Ariane 5 ECA 2012-075B
Africasat-1a STAR-2 Azercosmos 2010 07.02.2013, 21:36 Ariane 5 ECA 2013-006B
SES-8 GeoStar 2.4 SES World Skies 2011 December 3rd, 2013 , 10:41 pm Falcon 9 v1.1 2013-071A First launch of a Falcon 9 in a GTO
Thaicom 6 GeoStar-2.3 Thaicom 2011 01/06/2014, 22:06 Falcon 9 v1.1 2014-002A
Amazon 4A GeoStar 2.4 Hispasat 2012 March 22nd, 2014, 10:04 pm Ariane 5 ECA 2014-011B A fault in the power supply system shortened the service life
Amazon 4B GeoStar-2

Or 3

Hispasat 2012 2015 (originally) ? - Not started in the Amazon 5 converted
Sky Mexico 1 GeoStar-2.4E DirecTV 2013 May 27th, 2015, 9:16 pm Ariane 5 ECA 2015-026B
Palapa-E GeoStar 2.4 Indosat 2013 ? ? - The contract was terminated by Indosat,

because they lost the rights to the position 150.5 ° East

Thaicom 8 GeoStar-2.3 Thaicom 2014 May 27, 2016, 9:39 pm Falcon 9 v1.2 2016-031A
Al Yah 3 GeoStar-3 YahSat 2014 01/25/2018, 10:20 pm Ariane 5 ECA 2018-012A False start, orbit too low
GovSat-1 GeoStar-3 SES World Skies 2015 01/30/2018, 9:25 pm Falcon 9 v1.2 2018-013A
HYLAS-4 GeoStar-3 Avanti Communications 2014 04/05/2018, 9:34 pm Ariane 5 ECA 2018-033B

Satellites currently ordered

designation Bus version Orderer Year of appointment Start date ( UTC ) (planned) Launcher Remarks
Eutelsat 5 West B GeoStar-2e Eutelsat 2016 October 09, 2020 Proton-M / Bris-M
Galaxy 30 GeoStar-2e Intelsat 2018 2020 Ariane 5 ECA

Web links

Individual evidence

  1. ↑ Eutelsat 5 West B at Gunter's Space Page (English).
  2. ↑ Start date Eutelsat 5 West B at infodigital
  3. ↑ Galaxy 30 at Gunter's Space Page (English).